--- Begin Message ---
Package: release.debian.org
Severity: normal
Tags: trixie
X-Debbugs-Cc: [email protected], [email protected]
Control: affects -1 + src:libarchive
User: [email protected]
Usertags: pu
[ Reason ]
Fix no-dsa issues: CVE-2025-5918 CVE-2026-4111 CVE-2026-4424
CVE-2026-4426 CVE-2026-5121
All of those were just fixed in Debian LTS bullseye, and I'm now
proposing those fixes for trixie and bookworm. I reached out to the
maintainers of libarchive and got an ack from Syed (CCed to this bug
report).
[ Impact ]
Users are vulnerable to those CVEs.
[ Tests ]
CVE-2025-5918, CVE-2026-4111, CVE-2026-4426 and CVE-2026-5121 comes with
a test case. Note that CVE-2026-4426 and CVE-2026-5121 are in fact fixed
by the same patch, although there was two separate pull requests
upstream, and only the second one came with a test case.
CVE-2026-4424 doesn't have any test case, but the fix is very small and
applies cleanly.
[ Risks ]
All of the patches are targeted fixes and apply cleanly.
Except for CVE-2025-5918 (applied by Rouca), it is not trivial, however,
it comes with a test case, and it was released in Debian LTS back in
November 2025 (in version 3.4.3-2+deb11u3), no issues were reported.
[ Checklist ]
[x] *all* changes are documented in the d/changelog
[x] I reviewed all changes and I approve them
[x] attach debdiff against the package in (old)stable
[x] the issue is verified as fixed in unstable
[ Changes ]
* Fix CVE-2025-5918 (Closes: #1107624)
* Fix CVE-2026-4111 (Closes: #1130753)
* Fix CVE-2026-4424 (Closes: #1131446)
* Fix CVE-2026-4426 (Closes: #1131444)
* Fix CVE-2026-5121 (Closes: #1133002)
* Move debian/gitlab-ci.yml -> debian/salsa-ci.yml
[ Other info ]
Debusine results:
https://debusine.debian.net/debian/developers/work-request/627284/
Commits at:
https://salsa.debian.org/arnaudr/libarchive/-/tree/debian/trixie?ref_type=heads
Thanks,
Arnaud
diff -Nru libarchive-3.7.4/debian/changelog libarchive-3.7.4/debian/changelog
--- libarchive-3.7.4/debian/changelog 2025-07-24 21:40:32.000000000 +0700
+++ libarchive-3.7.4/debian/changelog 2026-04-24 11:36:34.000000000 +0700
@@ -1,3 +1,50 @@
+libarchive (3.7.4-4+deb13u1) trixie; urgency=medium
+
+ * Non-maintainer upload by the LTS team.
+
+ [ Bastien Roucaries ]
+ * Fix CVE-2025-5918 (Closes: #1107624)
+ A vulnerability has been identified in the libarchive library. This flaw
+ can be triggered when file streams are piped into bsdtar, potentially
+ allowing for reading past the end of the file. This out-of-bounds read
+ can lead to unintended consequences, including unpredictable program
+ behavior, memory corruption, or a denial-of-service condition.
+
+ [ Arnaud Rebillout ]
+ * Fix CVE-2026-4111 (Closes: #1130753)
+ A flaw was identified in the RAR5 archive decompression logic of the
+ libarchive library, specifically within the archive_read_data() processing
+ path. When a specially crafted RAR5 archive is processed, the
+ decompression routine may enter a state where internal logic prevents
+ forward progress. This condition results in an infinite loop that
+ continuously consumes CPU resources. Because the archive passes checksum
+ validation and appears structurally valid, affected applications cannot
+ detect the issue before processing. This can allow attackers to cause
+ persistent denial-of-service conditions in services that automatically
+ process archives.
+ * Fix CVE-2026-4424 (Closes: #1131446)
+ A flaw was found in libarchive. This heap out-of-bounds read vulnerability
+ exists in the RAR archive processing logic due to improper validation of
+ the LZSS sliding window size after transitions between compression
+ methods. A remote attacker can exploit this by providing a specially
+ crafted RAR archive, leading to the disclosure of sensitive heap memory
+ information without requiring authentication or user interaction.
+ * Fix CVE-2026-4426 (Closes: #1131444)
+ A flaw was found in libarchive. An Undefined Behavior vulnerability exists
+ in the zisofs decompression logic, caused by improper validation of a
+ field (`pz_log2_bs`) read from ISO9660 Rock Ridge extensions. A remote
+ attacker can exploit this by supplying a specially crafted ISO file. This
+ can lead to incorrect memory allocation and potential application crashes,
+ resulting in a denial-of-service (DoS) condition.
+ * Fix CVE-2026-5121 (Closes: #1133002)
+ A flaw was found in libarchive. On 32-bit systems, an integer overflow
+ vulnerability exists in the zisofs block pointer allocation logic. A
+ remote attacker can exploit this by providing a specially crafted ISO9660
+ image, which can lead to a heap buffer overflow. This could potentially
+ allow for arbitrary code execution on the affected system.
+
+ -- Arnaud Rebillout <[email protected]> Fri, 24 Apr 2026 11:36:34 +0700
+
libarchive (3.7.4-4) unstable; urgency=medium
* Add the CVE-2025-5914, CVE-2025-5915, CVE-2025-5916, and
diff -Nru libarchive-3.7.4/debian/gitlab-ci.yml
libarchive-3.7.4/debian/gitlab-ci.yml
--- libarchive-3.7.4/debian/gitlab-ci.yml 2025-07-24 21:40:32.000000000
+0700
+++ libarchive-3.7.4/debian/gitlab-ci.yml 1970-01-01 08:00:00.000000000
+0800
@@ -1,3 +0,0 @@
-include:
- - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/salsa-ci.yml
- -
https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/pipeline-jobs.yml
diff -Nru libarchive-3.7.4/debian/patches/CVE-2025-5918_1.patch
libarchive-3.7.4/debian/patches/CVE-2025-5918_1.patch
--- libarchive-3.7.4/debian/patches/CVE-2025-5918_1.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2025-5918_1.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,214 @@
+From: Tobias Stoeckmann <[email protected]>
+Date: Tue, 15 Apr 2025 06:02:17 +0200
+Subject: Do not skip past EOF while reading (#2584)
+
+Make sure to not skip past end of file for better error messages. One
+such example is now visible with rar testsuite. You can see the
+difference already by an actually not useless use of cat:
+
+```
+$ cat .../test_read_format_rar_ppmd_use_after_free.rar | bsdtar -t
+bsdtar: Archive entry has empty or unreadable filename ... skipping.
+bsdtar: Archive entry has empty or unreadable filename ... skipping.
+bsdtar: Truncated input file (needed 119 bytes, only 0 available)
+bsdtar: Error exit delayed from previous errors.
+```
+
+compared to
+
+```
+$ bsdtar -tf .../test_read_format_rar_ppmd_use_after_free.rar
+bsdtar: Archive entry has empty or unreadable filename ... skipping.
+bsdtar: Archive entry has empty or unreadable filename ... skipping.
+bsdtar: Error exit delayed from previous errors.
+```
+
+Since the former cannot lseek, the error is a different one
+(ARCHIVE_FATAL vs ARCHIVE_EOF). The piped version states explicitly that
+truncation occurred, while the latter states EOF because the skip past
+the end of file was successful.
+
+Signed-off-by: Tobias Stoeckmann <[email protected]>
+(cherry picked from commit dcbf1e0ededa95849f098d154a25876ed5754bcf)
+origin:
https://github.com/libarchive/libarchive/commit/dcbf1e0ededa95849f098d154a25876ed5754bcf
+---
+ libarchive/archive_read_open_fd.c | 13 ++++++++++---
+ libarchive/archive_read_open_file.c | 33 +++++++++++++++++++++++++--------
+ libarchive/archive_read_open_filename.c | 16 ++++++++++++----
+ libarchive/test/test_read_format_rar.c | 6 +++---
+ 4 files changed, 50 insertions(+), 18 deletions(-)
+
+diff --git a/libarchive/archive_read_open_fd.c
b/libarchive/archive_read_open_fd.c
+index 739fa37..3f975ab 100644
+--- a/libarchive/archive_read_open_fd.c
++++ b/libarchive/archive_read_open_fd.c
+@@ -52,6 +52,7 @@
+ struct read_fd_data {
+ int fd;
+ size_t block_size;
++ int64_t size;
+ char use_lseek;
+ void *buffer;
+ };
+@@ -95,6 +96,7 @@ archive_read_open_fd(struct archive *a, int fd, size_t
block_size)
+ if (S_ISREG(st.st_mode)) {
+ archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
+ mine->use_lseek = 1;
++ mine->size = st.st_size;
+ }
+ #if defined(__CYGWIN__) || defined(_WIN32)
+ setmode(mine->fd, O_BINARY);
+@@ -151,9 +153,14 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+ if (skip == 0)
+ return (0);
+
+- if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0) &&
+- ((new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0))
+- return (new_offset - old_offset);
++ if ((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0) {
++ if (old_offset >= mine->size ||
++ skip > mine->size - old_offset) {
++ /* Do not seek past end of file. */
++ errno = ESPIPE;
++ } else if ((new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0)
++ return (new_offset - old_offset);
++ }
+
+ /* If seek failed once, it will probably fail again. */
+ mine->use_lseek = 0;
+diff --git a/libarchive/archive_read_open_file.c
b/libarchive/archive_read_open_file.c
+index 10f872b..c7c1090 100644
+--- a/libarchive/archive_read_open_file.c
++++ b/libarchive/archive_read_open_file.c
+@@ -52,6 +52,7 @@
+ struct read_FILE_data {
+ FILE *f;
+ size_t block_size;
++ int64_t size;
+ void *buffer;
+ char can_skip;
+ };
+@@ -90,6 +91,7 @@ archive_read_open_FILE(struct archive *a, FILE *f)
+ archive_read_extract_set_skip_file(a, st.st_dev, st.st_ino);
+ /* Enable the seek optimization only for regular files. */
+ mine->can_skip = 1;
++ mine->size = st.st_size;
+ } else
+ mine->can_skip = 0;
+
+@@ -129,6 +131,7 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+ #else
+ long skip = (long)request;
+ #endif
++ int64_t old_offset, new_offset;
+ int skip_bits = sizeof(skip) * 8 - 1;
+
+ (void)a; /* UNUSED */
+@@ -152,19 +155,33 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+
+ #ifdef __ANDROID__
+ /* fileno() isn't safe on all platforms ... see above. */
+- if (lseek(fileno(mine->f), skip, SEEK_CUR) < 0)
++ old_offset = lseek(fileno(mine->f), 0, SEEK_CUR);
+ #elif HAVE__FSEEKI64
+- if (_fseeki64(mine->f, skip, SEEK_CUR) != 0)
++ old_offset = _ftelli64(mine->f);
+ #elif HAVE_FSEEKO
+- if (fseeko(mine->f, skip, SEEK_CUR) != 0)
++ old_offset = ftello(mine->f);
+ #else
+- if (fseek(mine->f, skip, SEEK_CUR) != 0)
++ old_offset = ftell(mine->f);
+ #endif
+- {
+- mine->can_skip = 0;
+- return (0);
++ if (old_offset >= 0) {
++ if (old_offset < mine->size &&
++ skip <= mine->size - old_offset) {
++#ifdef __ANDROID__
++ new_offset = lseek(fileno(mine->f), skip, SEEK_CUR);
++#elif HAVE__FSEEKI64
++ new_offset = _fseeki64(mine->f, skip, SEEK_CUR);
++#elif HAVE_FSEEKO
++ new_offset = fseeko(mine->f, skip, SEEK_CUR);
++#else
++ new_offset = fseek(mine->f, skip, SEEK_CUR);
++#endif
++ if (new_offset >= 0)
++ return (new_offset - old_offset);
++ }
+ }
+- return (request);
++
++ mine->can_skip = 0;
++ return (0);
+ }
+
+
+diff --git a/libarchive/archive_read_open_filename.c
b/libarchive/archive_read_open_filename.c
+index d5856d9..c405471 100644
+--- a/libarchive/archive_read_open_filename.c
++++ b/libarchive/archive_read_open_filename.c
+@@ -74,6 +74,7 @@ struct read_file_data {
+ size_t block_size;
+ void *buffer;
+ mode_t st_mode; /* Mode bits for opened file. */
++ int64_t size;
+ char use_lseek;
+ enum fnt_e { FNT_STDIN, FNT_MBS, FNT_WCS } filename_type;
+ union {
+@@ -400,8 +401,10 @@ file_open(struct archive *a, void *client_data)
+ mine->st_mode = st.st_mode;
+
+ /* Disk-like inputs can use lseek(). */
+- if (is_disk_like)
++ if (is_disk_like) {
+ mine->use_lseek = 1;
++ mine->size = st.st_size;
++ }
+
+ return (ARCHIVE_OK);
+ fail:
+@@ -495,9 +498,14 @@ file_skip_lseek(struct archive *a, void *client_data,
int64_t request)
+ skip = max_skip;
+ }
+
+- if ((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0 &&
+- (new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0)
+- return (new_offset - old_offset);
++ if ((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0) {
++ if (old_offset >= mine->size ||
++ skip > mine->size - old_offset) {
++ /* Do not seek past end of file. */
++ errno = ESPIPE;
++ } else if ((new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0)
++ return (new_offset - old_offset);
++ }
+
+ /* If lseek() fails, don't bother trying again. */
+ mine->use_lseek = 0;
+diff --git a/libarchive/test/test_read_format_rar.c
b/libarchive/test/test_read_format_rar.c
+index dce567a..fce44a9 100644
+--- a/libarchive/test/test_read_format_rar.c
++++ b/libarchive/test/test_read_format_rar.c
+@@ -3829,8 +3829,8 @@ DEFINE_TEST(test_read_format_rar_ppmd_use_after_free)
+ assertA(ARCHIVE_OK == archive_read_next_header(a, &ae));
+ assertA(archive_read_data(a, buf, sizeof(buf)) <= 0);
+
+- /* Test EOF */
+- assertA(1 == archive_read_next_header(a, &ae));
++ /* Test for truncation */
++ assertA(ARCHIVE_FATAL == archive_read_next_header(a, &ae));
+
+ assertEqualIntA(a, ARCHIVE_OK, archive_read_close(a));
+ assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+@@ -3856,7 +3856,7 @@ DEFINE_TEST(test_read_format_rar_ppmd_use_after_free2)
+ assertA(archive_read_data(a, buf, sizeof(buf)) <= 0);
+
+ /* Test EOF */
+- assertA(1 == archive_read_next_header(a, &ae));
++ assertA(ARCHIVE_FATAL == archive_read_next_header(a, &ae));
+
+ assertEqualIntA(a, ARCHIVE_OK, archive_read_close(a));
+ assertEqualInt(ARCHIVE_OK, archive_read_free(a));
diff -Nru libarchive-3.7.4/debian/patches/CVE-2025-5918_2.patch
libarchive-3.7.4/debian/patches/CVE-2025-5918_2.patch
--- libarchive-3.7.4/debian/patches/CVE-2025-5918_2.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2025-5918_2.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,47 @@
+From: Tobias Stoeckmann <[email protected]>
+Date: Tue, 27 May 2025 17:09:12 +0200
+Subject: Fix FILE_skip regression
+
+The fseek* family of functions return 0 on success, not the new offset.
+This is only true for lseek.
+
+Fixes https://github.com/libarchive/libarchive/issues/2641
+Fixes dcbf1e0ededa95849f098d154a25876ed5754bcf
+
+Signed-off-by: Tobias Stoeckmann <[email protected]>
+origin:
https://github.com/libarchive/libarchive/commit/51b4c35bb38b7df4af24de7f103863dd79129b01
+---
+ libarchive/archive_read_open_file.c | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/libarchive/archive_read_open_file.c
b/libarchive/archive_read_open_file.c
+index c7c1090..538e65d 100644
+--- a/libarchive/archive_read_open_file.c
++++ b/libarchive/archive_read_open_file.c
+@@ -131,7 +131,7 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+ #else
+ long skip = (long)request;
+ #endif
+- int64_t old_offset, new_offset;
++ int64_t old_offset, new_offset = -1;
+ int skip_bits = sizeof(skip) * 8 - 1;
+
+ (void)a; /* UNUSED */
+@@ -169,11 +169,14 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+ #ifdef __ANDROID__
+ new_offset = lseek(fileno(mine->f), skip, SEEK_CUR);
+ #elif HAVE__FSEEKI64
+- new_offset = _fseeki64(mine->f, skip, SEEK_CUR);
++ if (_fseeki64(mine->f, skip, SEEK_CUR) == 0)
++ new_offset = _ftelli64(mine->f);
+ #elif HAVE_FSEEKO
+- new_offset = fseeko(mine->f, skip, SEEK_CUR);
++ if (fseeko(mine->f, skip, SEEK_CUR) == 0)
++ new_offset = ftello(mine->f);
+ #else
+- new_offset = fseek(mine->f, skip, SEEK_CUR);
++ if (fseek(mine->f, skip, SEEK_CUR) == 0)
++ new_offset = ftell(mine->f);
+ #endif
+ if (new_offset >= 0)
+ return (new_offset - old_offset);
diff -Nru libarchive-3.7.4/debian/patches/CVE-2025-5918-pre1.patch
libarchive-3.7.4/debian/patches/CVE-2025-5918-pre1.patch
--- libarchive-3.7.4/debian/patches/CVE-2025-5918-pre1.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2025-5918-pre1.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,315 @@
+From: Tobias Stoeckmann <[email protected]>
+Date: Sun, 6 Apr 2025 22:34:37 +0200
+Subject: Improve lseek handling (#2564)
+
+The skip functions are limited to 1 GB for cases in which libarchive
+runs on a system with an off_t or long with 32 bits. This has negative
+impact on 64 bit systems.
+
+Instead, make sure that _all_ subsequent functions truncate properly.
+Some of them already did and some had regressions for over 10 years.
+
+Tests pass on Debian 12 i686 configured with --disable-largefile, i.e.
+running with an off_t with 32 bits.
+
+Casts added where needed to still pass MSVC builds.
+
+---------
+
+Signed-off-by: Tobias Stoeckmann <[email protected]>
+(cherry picked from commit 89b8c35ff4b5addc08a85bf5df02b407f8af1f6c)
+origin: backport,
https://github.com/libarchive/libarchive/commit/89b8c35ff4b5addc08a85bf5df02b407f8af1f6c
+---
+ libarchive/archive_read.c | 6 ----
+ libarchive/archive_read_disk_posix.c | 3 +-
+ libarchive/archive_read_open_fd.c | 29 ++++++++++++-----
+ libarchive/archive_read_open_file.c | 56 ++++++++++++++++++++++++++++++++-
+ libarchive/archive_read_open_filename.c | 37 ++++++++++++++++------
+ libarchive/test/read_open_memory.c | 2 +-
+ libarchive/test/test_sparse_basic.c | 6 ++--
+ libarchive/test/test_tar_large.c | 2 +-
+ 8 files changed, 111 insertions(+), 30 deletions(-)
+
+diff --git a/libarchive/archive_read.c b/libarchive/archive_read.c
+index d71fc2b..78f01bf 100644
+--- a/libarchive/archive_read.c
++++ b/libarchive/archive_read.c
+@@ -176,15 +176,9 @@ client_skip_proxy(struct archive_read_filter *self,
int64_t request)
+ return 0;
+
+ if (self->archive->client.skipper != NULL) {
+- /* Seek requests over 1GiB are broken down into
+- * multiple seeks. This avoids overflows when the
+- * requests get passed through 32-bit arguments. */
+- int64_t skip_limit = (int64_t)1 << 30;
+ int64_t total = 0;
+ for (;;) {
+ int64_t get, ask = request;
+- if (ask > skip_limit)
+- ask = skip_limit;
+ get = (self->archive->client.skipper)
+ (&self->archive->archive, self->data, ask);
+ total += get;
+diff --git a/libarchive/archive_read_disk_posix.c
b/libarchive/archive_read_disk_posix.c
+index 76a4fa4..99db2e3 100644
+--- a/libarchive/archive_read_disk_posix.c
++++ b/libarchive/archive_read_disk_posix.c
+@@ -778,7 +778,8 @@ _archive_read_data_block(struct archive *_a, const void
**buff,
+ */
+ if (t->current_sparse->offset > t->entry_total) {
+ if (lseek(t->entry_fd,
+- (off_t)t->current_sparse->offset, SEEK_SET) < 0) {
++ (off_t)t->current_sparse->offset, SEEK_SET) !=
++ t->current_sparse->offset) {
+ archive_set_error(&a->archive, errno, "Seek error");
+ r = ARCHIVE_FATAL;
+ a->archive.state = ARCHIVE_STATE_FATAL;
+diff --git a/libarchive/archive_read_open_fd.c
b/libarchive/archive_read_open_fd.c
+index 3ee2423..739fa37 100644
+--- a/libarchive/archive_read_open_fd.c
++++ b/libarchive/archive_read_open_fd.c
+@@ -131,7 +131,7 @@ static int64_t
+ file_skip(struct archive *a, void *client_data, int64_t request)
+ {
+ struct read_fd_data *mine = (struct read_fd_data *)client_data;
+- int64_t skip = request;
++ off_t skip = (off_t)request;
+ int64_t old_offset, new_offset;
+ int skip_bits = sizeof(skip) * 8 - 1; /* off_t is a signed type. */
+
+@@ -140,15 +140,15 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+
+ /* Reduce a request that would overflow the 'skip' variable. */
+ if (sizeof(request) > sizeof(skip)) {
+- int64_t max_skip =
++ const int64_t max_skip =
+ (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1;
+ if (request > max_skip)
+- skip = max_skip;
++ skip = (off_t)max_skip;
+ }
+
+- /* Reduce request to the next smallest multiple of block_size */
+- request = (request / mine->block_size) * mine->block_size;
+- if (request == 0)
++ /* Reduce 'skip' to the next smallest multiple of block_size */
++ skip = (off_t)(((int64_t)skip / mine->block_size) * mine->block_size);
++ if (skip == 0)
+ return (0);
+
+ if (((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0) &&
+@@ -178,11 +178,24 @@ static int64_t
+ file_seek(struct archive *a, void *client_data, int64_t request, int whence)
+ {
+ struct read_fd_data *mine = (struct read_fd_data *)client_data;
++ off_t seek = (off_t)request;
+ int64_t r;
++ int seek_bits = sizeof(seek) * 8 - 1; /* off_t is a signed type. */
+
+ /* We use off_t here because lseek() is declared that way. */
+- /* See above for notes about when off_t is less than 64 bits. */
+- r = lseek(mine->fd, request, whence);
++
++ /* Reduce a request that would overflow the 'seek' variable. */
++ if (sizeof(request) > sizeof(seek)) {
++ const int64_t max_seek =
++ (((int64_t)1 << (seek_bits - 1)) - 1) * 2 + 1;
++ const int64_t min_seek = ~max_seek;
++ if (request > max_seek)
++ seek = (off_t)max_seek;
++ else if (request < min_seek)
++ seek = (off_t)min_seek;
++ }
++
++ r = lseek(mine->fd, seek, whence);
+ if (r >= 0)
+ return r;
+
+diff --git a/libarchive/archive_read_open_file.c
b/libarchive/archive_read_open_file.c
+index dcf1d46..10f872b 100644
+--- a/libarchive/archive_read_open_file.c
++++ b/libarchive/archive_read_open_file.c
+@@ -144,7 +144,7 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+
+ /* If request is too big for a long or an off_t, reduce it. */
+ if (sizeof(request) > sizeof(skip)) {
+- int64_t max_skip =
++ const int64_t max_skip =
+ (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1;
+ if (request > max_skip)
+ skip = max_skip;
+@@ -167,6 +167,60 @@ file_skip(struct archive *a, void *client_data, int64_t
request)
+ return (request);
+ }
+
++
++/*
++ * TODO: Store the offset and use it in the read callback.
++ */
++static int64_t
++FILE_seek(struct archive *a, void *client_data, int64_t request, int whence)
++{
++ struct read_FILE_data *mine = (struct read_FILE_data *)client_data;
++#if HAVE__FSEEKI64
++ int64_t seek = request;
++#elif HAVE_FSEEKO
++ off_t seek = (off_t)request;
++#else
++ long seek = (long)request;
++#endif
++ int seek_bits = sizeof(seek) * 8 - 1;
++ (void)a; /* UNUSED */
++
++ /* Reduce a request that would overflow the 'seek' variable. */
++ if (sizeof(request) > sizeof(seek)) {
++ const int64_t max_seek =
++ (((int64_t)1 << (seek_bits - 1)) - 1) * 2 + 1;
++ const int64_t min_seek = ~max_seek;
++ if (request > max_seek)
++ seek = max_seek;
++ else if (request < min_seek)
++ seek = min_seek;
++ }
++
++#ifdef __ANDROID__
++ /* Newer Android versions have fseeko...to meditate. */
++ int64_t ret = lseek(fileno(mine->f), seek, whence);
++ if (ret >= 0) {
++ return ret;
++ }
++#elif HAVE__FSEEKI64
++ if (_fseeki64(mine->f, seek, whence) == 0) {
++ return _ftelli64(mine->f);
++ }
++#elif HAVE_FSEEKO
++ if (fseeko(mine->f, seek, whence) == 0) {
++ return ftello(mine->f);
++ }
++#else
++ if (fseek(mine->f, seek, whence) == 0) {
++ return ftell(mine->f);
++ }
++#endif
++ /* If we arrive here, the input is corrupted or truncated so fail. */
++ archive_set_error(a, errno, "Error seeking in FILE* pointer");
++ return (ARCHIVE_FATAL);
++}
++
++
+ static int
+ file_close(struct archive *a, void *client_data)
+ {
+diff --git a/libarchive/archive_read_open_filename.c
b/libarchive/archive_read_open_filename.c
+index dd2e160..d5856d9 100644
+--- a/libarchive/archive_read_open_filename.c
++++ b/libarchive/archive_read_open_filename.c
+@@ -479,20 +479,24 @@ file_skip_lseek(struct archive *a, void *client_data,
int64_t request)
+ struct read_file_data *mine = (struct read_file_data *)client_data;
+ #if defined(_WIN32) && !defined(__CYGWIN__)
+ /* We use _lseeki64() on Windows. */
+- int64_t old_offset, new_offset;
++ int64_t old_offset, new_offset, skip = request;
+ #else
+- off_t old_offset, new_offset;
++ off_t old_offset, new_offset, skip = (off_t)request;
+ #endif
++ int skip_bits = sizeof(skip) * 8 - 1;
+
+ /* We use off_t here because lseek() is declared that way. */
+
+- /* TODO: Deal with case where off_t isn't 64 bits.
+- * This shouldn't be a problem on Linux or other POSIX
+- * systems, since the configuration logic for libarchive
+- * tries to obtain a 64-bit off_t.
+- */
++ /* Reduce a request that would overflow the 'skip' variable. */
++ if (sizeof(request) > sizeof(skip)) {
++ const int64_t max_skip =
++ (((int64_t)1 << (skip_bits - 1)) - 1) * 2 + 1;
++ if (request > max_skip)
++ skip = max_skip;
++ }
++
+ if ((old_offset = lseek(mine->fd, 0, SEEK_CUR)) >= 0 &&
+- (new_offset = lseek(mine->fd, request, SEEK_CUR)) >= 0)
++ (new_offset = lseek(mine->fd, skip, SEEK_CUR)) >= 0)
+ return (new_offset - old_offset);
+
+ /* If lseek() fails, don't bother trying again. */
+@@ -540,11 +544,24 @@ static int64_t
+ file_seek(struct archive *a, void *client_data, int64_t request, int whence)
+ {
+ struct read_file_data *mine = (struct read_file_data *)client_data;
++ off_t seek = (off_t)request;
+ int64_t r;
++ int seek_bits = sizeof(seek) * 8 - 1;
+
+ /* We use off_t here because lseek() is declared that way. */
+- /* See above for notes about when off_t is less than 64 bits. */
+- r = lseek(mine->fd, request, whence);
++
++ /* Reduce a request that would overflow the 'seek' variable. */
++ if (sizeof(request) > sizeof(seek)) {
++ const int64_t max_seek =
++ (((int64_t)1 << (seek_bits - 1)) - 1) * 2 + 1;
++ const int64_t min_seek = ~max_seek;
++ if (request > max_seek)
++ seek = (off_t)max_seek;
++ else if (request < min_seek)
++ seek = (off_t)min_seek;
++ }
++
++ r = lseek(mine->fd, seek, whence);
+ if (r >= 0)
+ return r;
+
+diff --git a/libarchive/test/read_open_memory.c
b/libarchive/test/read_open_memory.c
+index 6d2468c..9262ab9 100644
+--- a/libarchive/test/read_open_memory.c
++++ b/libarchive/test/read_open_memory.c
+@@ -167,7 +167,7 @@ memory_read_skip(struct archive *a, void *client_data,
int64_t skip)
+
+ (void)a; /* UNUSED */
+ /* We can't skip by more than is available. */
+- if ((off_t)skip > (off_t)(mine->end - mine->p))
++ if (skip > mine->end - mine->p)
+ skip = mine->end - mine->p;
+ /* Always do small skips by prime amounts. */
+ if (skip > 71)
+diff --git a/libarchive/test/test_sparse_basic.c
b/libarchive/test/test_sparse_basic.c
+index 0350df1..192570a 100644
+--- a/libarchive/test/test_sparse_basic.c
++++ b/libarchive/test/test_sparse_basic.c
+@@ -605,7 +605,8 @@ DEFINE_TEST(test_sparse_basic)
+ verify_sparse_file(a, "file2", sparse_file2, 20);
+ /* Encoded non sparse; expect a data block but no sparse entries. */
+ verify_sparse_file(a, "file3", sparse_file3, 0);
+- verify_sparse_file(a, "file4", sparse_file4, 2);
++ if (sizeof(off_t) > 4)
++ verify_sparse_file(a, "file4", sparse_file4, 2);
+
+ assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+
+@@ -632,7 +633,8 @@ DEFINE_TEST(test_sparse_basic)
+ verify_sparse_file(a, "file1", sparse_file1, 0);
+ verify_sparse_file(a, "file2", sparse_file2, 0);
+ verify_sparse_file(a, "file3", sparse_file3, 0);
+- verify_sparse_file(a, "file4", sparse_file4, 0);
++ if (sizeof(off_t) > 4)
++ verify_sparse_file(a, "file4", sparse_file4, 0);
+
+ assertEqualInt(ARCHIVE_OK, archive_read_free(a));
+
+diff --git a/libarchive/test/test_tar_large.c
b/libarchive/test/test_tar_large.c
+index 7ff3fee..bf20a9d 100644
+--- a/libarchive/test/test_tar_large.c
++++ b/libarchive/test/test_tar_large.c
+@@ -175,7 +175,7 @@ memory_read_skip(struct archive *a, void *_private,
int64_t skip)
+ }
+ if (private->filebytes > 0) {
+ if (private->filebytes < skip)
+- skip = (off_t)private->filebytes;
++ skip = private->filebytes;
+ private->filebytes -= skip;
+ } else {
+ skip = 0;
diff -Nru libarchive-3.7.4/debian/patches/CVE-2026-4111-1.patch
libarchive-3.7.4/debian/patches/CVE-2026-4111-1.patch
--- libarchive-3.7.4/debian/patches/CVE-2026-4111-1.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2026-4111-1.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,302 @@
+From: Tim Kientzle <[email protected]>
+Date: Sun, 1 Mar 2026 10:04:01 -0800
+Subject: Infinite loop in Rar5 decompression
+
+Found by: Elhanan Haenel
+
+Origin: backport,
https://github.com/libarchive/libarchive/commit/ef53e2023d75a205cf7cbddb5d01c4cc592e9ce4
+---
+ Makefile.am | 2 +
+ libarchive/test/CMakeLists.txt | 1 +
+ libarchive/test/test_read_format_rar5_loop_bug.c | 53 ++++++
+ .../test/test_read_format_rar5_loop_bug.rar.uu | 189 +++++++++++++++++++++
+ 4 files changed, 245 insertions(+)
+ create mode 100644 libarchive/test/test_read_format_rar5_loop_bug.c
+ create mode 100644 libarchive/test/test_read_format_rar5_loop_bug.rar.uu
+
+diff --git a/Makefile.am b/Makefile.am
+index ae596b7..afe456f 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -513,6 +513,7 @@ libarchive_test_SOURCES= \
+ libarchive/test/test_read_format_rar_invalid1.c \
+ libarchive/test/test_read_format_rar_overflow.c \
+ libarchive/test/test_read_format_rar5.c \
++ libarchive/test/test_read_format_rar5_loop_bug.c \
+ libarchive/test/test_read_format_raw.c \
+ libarchive/test/test_read_format_tar.c \
+ libarchive/test/test_read_format_tar_concatenated.c \
+@@ -891,6 +892,7 @@ libarchive_test_EXTRA_DIST=\
+ libarchive/test/test_read_format_rar5_invalid_dict_reference.rar.uu \
+ libarchive/test/test_read_format_rar5_leftshift1.rar.uu \
+ libarchive/test/test_read_format_rar5_leftshift2.rar.uu \
++ libarchive/test/test_read_format_rar5_loop_bug.rar.uu \
+ libarchive/test/test_read_format_rar5_multiarchive.part01.rar.uu \
+ libarchive/test/test_read_format_rar5_multiarchive.part02.rar.uu \
+ libarchive/test/test_read_format_rar5_multiarchive.part03.rar.uu \
+diff --git a/libarchive/test/CMakeLists.txt b/libarchive/test/CMakeLists.txt
+index 0baf2de..a683109 100644
+--- a/libarchive/test/CMakeLists.txt
++++ b/libarchive/test/CMakeLists.txt
+@@ -157,6 +157,7 @@ IF(ENABLE_TEST)
+ test_read_format_rar_filter.c
+ test_read_format_rar_overflow.c
+ test_read_format_rar5.c
++ test_read_format_rar5_loop_bug.c
+ test_read_format_raw.c
+ test_read_format_tar.c
+ test_read_format_tar_concatenated.c
+diff --git a/libarchive/test/test_read_format_rar5_loop_bug.c
b/libarchive/test/test_read_format_rar5_loop_bug.c
+new file mode 100644
+index 0000000..77dd78c
+--- /dev/null
++++ b/libarchive/test/test_read_format_rar5_loop_bug.c
+@@ -0,0 +1,53 @@
++/*-
++ * Copyright (c) 2026 Tim Kientzle
++ * All rights reserved.
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ * notice, this list of conditions and the following disclaimer.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
++ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
++ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
++ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
++ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
++ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
++ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
++ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
++ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
++ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
++ */
++#include "test.h"
++
++DEFINE_TEST(test_read_format_rar5_loop_bug)
++{
++ const char *reffile = "test_read_format_rar5_loop_bug.rar";
++ struct archive_entry *ae;
++ struct archive *a;
++ const void *buf;
++ size_t size;
++ la_int64_t offset;
++
++ extract_reference_file(reffile);
++ assert((a = archive_read_new()) != NULL);
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a));
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a));
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_open_filename(a, reffile,
10240));
++
++ // This has just one entry
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_next_header(a, &ae));
++
++ // Read blocks until the end of the entry
++ while (ARCHIVE_OK == archive_read_data_block(a, &buf, &size, &offset)) {
++ }
++
++ assertEqualIntA(a, ARCHIVE_EOF, archive_read_next_header(a, &ae));
++
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_close(a));
++ assertEqualInt(ARCHIVE_OK, archive_free(a));
++}
+diff --git a/libarchive/test/test_read_format_rar5_loop_bug.rar.uu
b/libarchive/test/test_read_format_rar5_loop_bug.rar.uu
+new file mode 100644
+index 0000000..3e47004
+--- /dev/null
++++ b/libarchive/test/test_read_format_rar5_loop_bug.rar.uu
+@@ -0,0 +1,189 @@
++begin 644 test_read_format_rar5_loop_bug.rar
++M4F%R(1H'`0#%&C,R`P$``)T-9%L.`@+P0`"`@`P`@`,``6'(WFP@`?\7_U/^
++M8@!.`B`H````````````````````````````````````````````````````
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++M````````````````````````````````````````````````````````````
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++5```````````````````Y^;*!`@4`
++`
++end
diff -Nru libarchive-3.7.4/debian/patches/CVE-2026-4111-2.patch
libarchive-3.7.4/debian/patches/CVE-2026-4111-2.patch
--- libarchive-3.7.4/debian/patches/CVE-2026-4111-2.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2026-4111-2.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,26 @@
+From: Tim Kientzle <[email protected]>
+Date: Sun, 1 Mar 2026 20:24:56 -0800
+Subject: Reject filters when the block length is nonsensical
+
+Credit: Grzegorz Antoniak @antekone
+
+Origin: upstream,
https://github.com/libarchive/libarchive/commit/7273d04803a1e5a482f26d8d0fbaf2b204a72168
+---
+ libarchive/archive_read_support_format_rar5.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/libarchive/archive_read_support_format_rar5.c
b/libarchive/archive_read_support_format_rar5.c
+index e8846a5..1a8a156 100644
+--- a/libarchive/archive_read_support_format_rar5.c
++++ b/libarchive/archive_read_support_format_rar5.c
+@@ -2919,7 +2919,9 @@ static int parse_filter(struct archive_read* ar, const
uint8_t* p) {
+ if(block_length < 4 ||
+ block_length > 0x400000 ||
+ filter_type > FILTER_ARM ||
+- !is_valid_filter_block_start(rar, block_start))
++ !is_valid_filter_block_start(rar, block_start) ||
++ (rar->cstate.window_size > 0 &&
++ (ssize_t)block_length > rar->cstate.window_size >> 1))
+ {
+ archive_set_error(&ar->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+ "Invalid filter encountered");
diff -Nru libarchive-3.7.4/debian/patches/CVE-2026-4424-1.patch
libarchive-3.7.4/debian/patches/CVE-2026-4424-1.patch
--- libarchive-3.7.4/debian/patches/CVE-2026-4424-1.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2026-4424-1.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,55 @@
+From: elhananhaenel <[email protected]>
+Date: Sat, 7 Mar 2026 22:32:09 +0200
+Subject: rar: fix LZSS window size mismatch after PPMd block
+
+When a PPMd-compressed block updates dictionary_size, the LZSS window
+from a prior block is not reallocated. The allocation guard only checks
+if dictionary_size is zero or the window pointer is NULL, not whether
+the existing window is large enough. This allows copy_from_lzss_window()
+to read past the allocated buffer.
+
+Fix the guard to also check whether the current window is undersized.
+Add bounds checks in copy_from_lzss_window() and parse_filter() as
+defense in depth.
+
+Origin: upstream,
https://github.com/libarchive/libarchive/commit/d379dc0b2976b7207d1ad78f5ed3eb99a5b6d375
+---
+ libarchive/archive_read_support_format_rar.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/libarchive/archive_read_support_format_rar.c
b/libarchive/archive_read_support_format_rar.c
+index 85b738a..0240af7 100644
+--- a/libarchive/archive_read_support_format_rar.c
++++ b/libarchive/archive_read_support_format_rar.c
+@@ -2474,7 +2474,8 @@ parse_codes(struct archive_read *a)
+ return (r);
+ }
+
+- if (!rar->dictionary_size || !rar->lzss.window)
++ if (!rar->dictionary_size || !rar->lzss.window ||
++ (rar->lzss.mask + 1) < rar->dictionary_size)
+ {
+ /* Seems as though dictionary sizes are not used. Even so, minimize
+ * memory usage as much as possible.
+@@ -3078,6 +3079,11 @@ copy_from_lzss_window(struct archive_read *a, uint8_t
*buffer,
+
+ windowoffs = lzss_offset_for_position(&rar->lzss, startpos);
+ firstpart = lzss_size(&rar->lzss) - windowoffs;
++ if (length > lzss_size(&rar->lzss)) {
++ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
++ "Bad RAR file data");
++ return (ARCHIVE_FATAL);
++ }
+ if (firstpart < 0) {
+ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+ "Bad RAR file data");
+@@ -3240,7 +3246,8 @@ parse_filter(struct archive_read *a, const uint8_t
*bytes, uint16_t length, uint
+ else
+ blocklength = prog ? prog->oldfilterlength : 0;
+
+- if (blocklength > rar->dictionary_size)
++ if (blocklength > rar->dictionary_size ||
++ blocklength > (uint32_t)(rar->lzss.mask + 1))
+ return 0;
+
+ registers[3] = PROGRAM_SYSTEM_GLOBAL_ADDRESS;
diff -Nru libarchive-3.7.4/debian/patches/CVE-2026-4424-2.patch
libarchive-3.7.4/debian/patches/CVE-2026-4424-2.patch
--- libarchive-3.7.4/debian/patches/CVE-2026-4424-2.patch 1970-01-01
08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2026-4424-2.patch 2026-04-24
11:36:34.000000000 +0700
@@ -0,0 +1,22 @@
+From: elhananhaenel <[email protected]>
+Date: Sun, 8 Mar 2026 15:29:46 +0200
+Subject: Fix -Wsign-compare: cast mask+1 to unsigned int
+
+Origin: upstream,
https://github.com/libarchive/libarchive/commit/e1907c5832b6489c7b4198b0825f857c93a03c10
+---
+ libarchive/archive_read_support_format_rar.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libarchive/archive_read_support_format_rar.c
b/libarchive/archive_read_support_format_rar.c
+index 0240af7..5be42c7 100644
+--- a/libarchive/archive_read_support_format_rar.c
++++ b/libarchive/archive_read_support_format_rar.c
+@@ -2475,7 +2475,7 @@ parse_codes(struct archive_read *a)
+ }
+
+ if (!rar->dictionary_size || !rar->lzss.window ||
+- (rar->lzss.mask + 1) < rar->dictionary_size)
++ (unsigned int)(rar->lzss.mask + 1) < rar->dictionary_size)
+ {
+ /* Seems as though dictionary sizes are not used. Even so, minimize
+ * memory usage as much as possible.
diff -Nru libarchive-3.7.4/debian/patches/CVE-2026-4426_CVE-2026-5121.patch
libarchive-3.7.4/debian/patches/CVE-2026-4426_CVE-2026-5121.patch
--- libarchive-3.7.4/debian/patches/CVE-2026-4426_CVE-2026-5121.patch
1970-01-01 08:00:00.000000000 +0800
+++ libarchive-3.7.4/debian/patches/CVE-2026-4426_CVE-2026-5121.patch
2026-04-24 11:36:34.000000000 +0700
@@ -0,0 +1,1286 @@
+From: elhananhaenel <[email protected]>
+Date: Thu, 19 Mar 2026 16:43:29 +0200
+Subject: [PATCH] Add regression test for zisofs 32-bit heap overflow
+
+A crafted ISO with pz_log2_bs=2 and pz_uncompressed_size=0xFFFFFFF9
+causes an integer overflow in the block pointer allocation in
+zisofs_read_data(). On 32-bit, (ceil+1)*4 wraps size_t to 0, malloc(0)
+returns a tiny buffer, and the code writes ~4GB past it.
+
+The pz_log2_bs validation fix prevents this. Add a regression test with
+a crafted 48KB ISO that triggers the overflow on unfixed 32-bit builds.
+
+Origin: upstream,
https://github.com/libarchive/libarchive/commit/a2a73a8f14b3208c7f6acbbc93265254a7c1efd0
+---
+ Makefile.am | 2 +
+ libarchive/archive_read_support_format_iso9660.c | 8 +
+ libarchive/test/CMakeLists.txt | 1 +
+ .../test/test_read_format_iso_zisofs_overflow.c | 104 ++++++
+ ...=> test_read_format_iso_zisofs_overflow.iso.uu} | 401 ++++-----------------
+ 5 files changed, 179 insertions(+), 337 deletions(-)
+ create mode 100644 libarchive/test/test_read_format_iso_zisofs_overflow.c
+ create mode 100644 libarchive/test/test_read_format_iso_zisofs_overflow.iso.uu
+
+diff --git a/Makefile.am b/Makefile.am
+index afe456f..de3c2f2 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -498,6 +498,7 @@ libarchive_test_SOURCES= \
+ libarchive/test/test_read_format_isorr_new_bz2.c \
+ libarchive/test/test_read_format_isorr_rr_moved.c \
+ libarchive/test/test_read_format_isozisofs_bz2.c \
++ libarchive/test/test_read_format_iso_zisofs_overflow.c \
+ libarchive/test/test_read_format_lha.c \
+ libarchive/test/test_read_format_lha_bugfix_0.c \
+ libarchive/test/test_read_format_lha_filename.c \
+@@ -842,6 +843,7 @@ libarchive_test_EXTRA_DIST=\
+ libarchive/test/test_read_format_iso_rockridge_rr_moved.iso.Z.uu \
+ libarchive/test/test_read_format_iso_xorriso.iso.Z.uu \
+ libarchive/test/test_read_format_iso_zisofs.iso.Z.uu \
++ libarchive/test/test_read_format_iso_zisofs_overflow.iso.uu \
+ libarchive/test/test_read_format_lha_bugfix_0.lzh.uu \
+ libarchive/test/test_read_format_lha_filename_cp932.lzh.uu \
+ libarchive/test/test_read_format_lha_filename_utf16.lzh.uu \
+diff --git a/libarchive/archive_read_support_format_iso9660.c
b/libarchive/archive_read_support_format_iso9660.c
+index db5cdb6..2a65ebf 100644
+--- a/libarchive/archive_read_support_format_iso9660.c
++++ b/libarchive/archive_read_support_format_iso9660.c
+@@ -2645,6 +2645,14 @@ parse_rockridge_ZF1(struct file_info *file, const
unsigned char *data,
+ /* paged zlib */
+ file->pz = 1;
+ file->pz_log2_bs = data[3];
++ if (file->pz_log2_bs < 15 || file->pz_log2_bs > 17) {
++ /* TODO: Return an error here instead of silently
++ * disabling zisofs. That requires propagating an
++ * error return through parse_rockridge() and its
++ * callers. */
++ file->pz = 0;
++ return;
++ }
+ file->pz_uncompressed_size = archive_le32dec(&data[4]);
+ }
+ }
+diff --git a/libarchive/test/CMakeLists.txt b/libarchive/test/CMakeLists.txt
+index a683109..4c056fa 100644
+--- a/libarchive/test/CMakeLists.txt
++++ b/libarchive/test/CMakeLists.txt
+@@ -142,6 +142,7 @@ IF(ENABLE_TEST)
+ test_read_format_isorr_new_bz2.c
+ test_read_format_isorr_rr_moved.c
+ test_read_format_isozisofs_bz2.c
++ test_read_format_iso_zisofs_overflow.c
+ test_read_format_lha.c
+ test_read_format_lha_bugfix_0.c
+ test_read_format_lha_filename.c
+diff --git a/libarchive/test/test_read_format_iso_zisofs_overflow.c
b/libarchive/test/test_read_format_iso_zisofs_overflow.c
+new file mode 100644
+index 0000000..bad52b1
+--- /dev/null
++++ b/libarchive/test/test_read_format_iso_zisofs_overflow.c
+@@ -0,0 +1,104 @@
++/*-
++ * Copyright (c) 2025
++ * All rights reserved.
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ * notice, this list of conditions and the following disclaimer.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
++ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
++ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
++ * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
++ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
++ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
++ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
++ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
++ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
++ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
++ */
++#include "test.h"
++
++/*
++ * Verify that a crafted ISO9660 image with an invalid zisofs block-size
++ * exponent (pz_log2_bs) is handled gracefully.
++ *
++ * The ZF extension in the Rock Ridge entry stores pz_log2_bs as a raw
++ * byte from the image. The zisofs spec only permits values 15-17.
++ * Values outside that range can cause:
++ * - Undefined behavior via oversized bit shifts (any platform)
++ * - Integer overflow in block pointer allocation on 32-bit platforms,
++ * leading to a heap buffer overflow write
++ *
++ * The test image has pz_log2_bs=2 (out of spec) combined with
++ * pz_uncompressed_size=0xFFFFFFF9. On 32-bit, (ceil+1)*4 overflows
++ * size_t to 0, malloc(0) returns a tiny buffer, and the code attempts
++ * to write ~4GB into it. On 64-bit the allocation is huge and safely
++ * fails.
++ *
++ * We verify the fix by checking archive_entry_size() after reading the
++ * header. When pz_log2_bs validation rejects the bad value (pz=0),
++ * the entry keeps its raw on-disk size (small). Without the fix,
++ * the reader sets the entry size to pz_uncompressed_size (0xFFFFFFF9).
++ *
++ * We intentionally do NOT call archive_read_data() here. Without the
++ * fix, the data-read path triggers a heap buffer overflow on 32-bit
++ * that silently corrupts the process heap, causing later tests to
++ * crash rather than this one.
++ */
++DEFINE_TEST(test_read_format_iso_zisofs_overflow)
++{
++ const char reffile[] = "test_read_format_iso_zisofs_overflow.iso";
++ struct archive *a;
++ struct archive_entry *ae;
++ int r = ARCHIVE_OK;
++ int found_regular_file = 0;
++
++ extract_reference_file(reffile);
++ assert((a = archive_read_new()) != NULL);
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_support_filter_all(a));
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_support_format_all(a));
++ assertEqualIntA(a, ARCHIVE_OK,
++ archive_read_open_filename(a, reffile, 10240));
++
++ while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK ||
++ r == ARCHIVE_WARN) {
++ /*
++ * With the fix, pz_log2_bs=2 is rejected and pz is set
++ * to 0, so the entry keeps its small raw size from the
++ * ISO directory record. Without the fix, zisofs sets
++ * the entry size to pz_uncompressed_size (0xFFFFFFF9).
++ *
++ * We intentionally do NOT call archive_read_data().
++ * Without the fix, the data-read path triggers a heap
++ * buffer overflow on 32-bit that silently corrupts the
++ * process heap, causing later tests to crash rather
++ * than this one.
++ */
++ if (archive_entry_filetype(ae) == AE_IFREG) {
++ la_int64_t sz = archive_entry_size(ae);
++ failure("entry \"%s\" has size %jd"
++ "; expected < 1 MiB"
++ " (if size is 4294966265 = 0xFFFFFFF9, the"
++ " pz_log2_bs validation is missing)",
++ archive_entry_pathname(ae), (intmax_t)sz);
++ assert(sz < 1024 * 1024);
++ found_regular_file = 1;
++ }
++ }
++
++ /* Iteration must have completed normally. */
++ assertEqualInt(ARCHIVE_EOF, r);
++
++ /* The PoC image contains a regular file; if we never saw one,
++ * something is wrong with the test image. */
++ assert(found_regular_file);
++
++ assertEqualIntA(a, ARCHIVE_OK, archive_read_close(a));
++ assertEqualInt(ARCHIVE_OK, archive_read_free(a));
++}
+diff --git a/libarchive/test/test_read_format_iso_zisofs_overflow.iso.uu
b/libarchive/test/test_read_format_iso_zisofs_overflow.iso.uu
+new file mode 100644
+index 0000000000..5e7dcc3750
+--- /dev/null
++++ b/libarchive/test/test_read_format_iso_zisofs_overflow.iso.uu
+@@ -0,0 +1,1096 @@
++begin 664 test_read_format_iso_zisofs_overflow.iso
++M````````````````````````````````````````````````````````````
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++,````````````````
++`
++end
diff -Nru libarchive-3.7.4/debian/patches/series
libarchive-3.7.4/debian/patches/series
--- libarchive-3.7.4/debian/patches/series 2025-07-24 21:40:32.000000000
+0700
+++ libarchive-3.7.4/debian/patches/series 2026-04-24 11:36:34.000000000
+0700
@@ -7,3 +7,11 @@
CVE-2025-5915.patch
CVE-2025-5916.patch
CVE-2025-5917.patch
+CVE-2025-5918-pre1.patch
+CVE-2025-5918_1.patch
+CVE-2025-5918_2.patch
+CVE-2026-4111-1.patch
+CVE-2026-4111-2.patch
+CVE-2026-4424-1.patch
+CVE-2026-4424-2.patch
+CVE-2026-4426_CVE-2026-5121.patch
diff -Nru libarchive-3.7.4/debian/salsa-ci.yml
libarchive-3.7.4/debian/salsa-ci.yml
--- libarchive-3.7.4/debian/salsa-ci.yml 1970-01-01 08:00:00.000000000
+0800
+++ libarchive-3.7.4/debian/salsa-ci.yml 2026-04-24 11:36:34.000000000
+0700
@@ -0,0 +1,6 @@
+include:
+ - https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/salsa-ci.yml
+ -
https://salsa.debian.org/salsa-ci-team/pipeline/raw/master/pipeline-jobs.yml
+
+variables:
+ RELEASE: 'trixie'
--- End Message ---
