Hello! We are pleased to announce the availability of a new GnuPG release: version 2.5.17. This version fixes a *critical security bug* in versions 2.5.13 to 2.5.16. We also released a new Gpg4win version and updated Debian packages.
Impact ====== These versions are affected: - GnuPG 2.5.16 (released 2025-12-30) - GnuPG 2.5.15 (released 2025-12-29) - GnuPG 2.5.14 (released 2025-11-19) - GnuPG 2.5.13 (released 2025-10-22) - Gpg4win 5.0.0 (released 2026-01-14) - Gpg4win 5.0.0-beta479 (released 2026-01-02) - Gpg4win 5.0.0-beta476 (released 2025-12-22) - Gpg4win 5.0.0-beta395 (released 2025-10-22) All other versions are not affected. A crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack buffer overflow in gpg-agent during the PKDECRYPT--kem=CMS handling. This can easily be used for a DoS but, worse, the memory corruption can very likley also be used to mount a remote code execution attack. The bug was introduced while changing an internal API to the FIPS required KEM API. A CVE-id has not been assigned. We track this bug as T8044 under https://dev.gnupg.org/T8044. This vulnerability was discovered by: OpenAI Security Research. Their report was received on 2026-01-18; fixed versions released 2026-01-27. Solution ======== If an affected GnuPG version is used please update ASAP to the new version 2.5.17. If an affected version of Gpg4win is used please update ASAP to the new version 5.0.1. If an immediate update is not possible please remove the gpgsm or gpgsm.exe binary; this way the bug can't be remotely triggered. Noteworthy changes in version 2.5.17 (2026-01-27) ================================================= [compared to version 2.5.16] * agent: Fix stack buffer overflow when using gpgsm and KEM. This was introduced with 2.5.13; see above. [T8044] * tpm: Fix possible buffer overflow in PKDECRYPT. [T8045] * gpg: Fix possible NULL-deref with overlong signature packets. [T8049] * gpg: New export-option "keep-expired-subkeys". [T7990] * gpgsm: Make multiple search patterns work with keyboxd. [T8026] * agent: Add accelerator keys for "Wrong" and "Correct". [T8055] * dirmngr: Help detection of bad keyserver configurations. [T7730] Release-info: https://dev.gnupg.org/T7996 Getting the Software ==================== Please follow the instructions found at <https://gnupg.org/download/> or read on: GnuPG may be downloaded from one of the GnuPG mirror sites or direct from its primary file server. The list of mirrors can be found at <https://gnupg.org/download/mirrors.html>. Note that GnuPG is not available at ftp.gnu.org. The GnuPG source code compressed using BZIP2 and its OpenPGP signature are available here: https://gnupg.org/ftp/gcrypt/gnupg/gnupg-2.5.17.tar.bz2 (8113k) https://gnupg.org/ftp/gcrypt/gnupg/gnupg-2.5.17.tar.bz2.sig An installer for Windows without any graphical frontend except for a very minimal Pinentry tool is available here: https://gnupg.org/ftp/gcrypt/binary/gnupg-w32-2.5.17_20260127.exe (5573k) https://gnupg.org/ftp/gcrypt/binary/gnupg-w32-2.5.17_20260127.exe.sig The source used to build this installer for 64-bit Windows is available as https://gnupg.org/ftp/gcrypt/gnupg/gnupg-w32-2.5.17_20260127.tar.xz (15M) https://gnupg.org/ftp/gcrypt/gnupg/gnupg-w32-2.5.17_20260127.tar.xz.sig This source tarball may also be used to download all required libraries at once to build a Unix version on any modern system. See the included README. Debian Packages =============== We also provide new Debian style packages for a couple of Debian variants. See https://repos.gnupg.org/deb/gnupg/trixie/ or use the menu to switch to other distros/releases. It may take a view hours before the new packages show up. If you encounter other packaging problems please report them to the gnupg-devel mailing list. Windows Installer ================= A new version of Gpg4win (5.0.1), our full featured Windows installer, including this version of GnuPG, the Kleopatra GUI, and a PDF reader has also been released. Head over to https://gpg4win.org/ Checking the Integrity ====================== In order to check that the version of GnuPG which you are going to install is an original and unmodified one, you can do it in one of the following ways: * If you already have a version of GnuPG installed, you can simply verify the supplied signature. For example to verify the signature of the file gnupg-2.5.17.tar.bz2 you would use this command: gpg --verify gnupg-2.5.17.tar.bz2.sig gnupg-2.5.17.tar.bz2 This checks whether the signature file matches the source file. You should see a message indicating that the signature is good and made by one or more of the release signing keys. Make sure that this is a valid key, either by matching the shown fingerprint against a trustworthy list of valid release signing keys or by checking that the key has been signed by trustworthy other keys. See the end of this mail for information on the signing keys. * If you are not able to use an existing version of GnuPG, you have to verify the SHA-1 checksum. On Unix systems the command to do this is either "sha1sum" or "shasum". Assuming you downloaded the file gnupg-2.5.17.tar.bz2, you run the command like this: sha1sum gnupg-2.5.17.tar.bz2 and check that the output matches the next line: ee0bc59eadf258b6d92131911b5dca6cabc89419 gnupg-2.5.17.tar.bz2 8826ff58e245c9700391fefff34afe775300e7cd gnupg-w32-2.5.17_20260127.tar.xz 31ac31fe8f5b4f3e3ae8e5e6a70c967a59f66e63 gnupg-w32-2.5.17_20260127.exe Internationalization ==================== This version of GnuPG has support for 26 languages with Chinese, Czech, Dutch, French, Georgian, German, Italian, Japanese, Norwegian, Polish, Portuguese, Russian, Swedish, Turkish, and Ukrainian being almost completely translated. Documentation and Support ========================= The file gnupg.info has the complete reference manual of the system. Separate man pages are included as well but they miss some of the details available only in the manual. The manual is also available online at https://gnupg.org/documentation/manuals/gnupg/ or can be downloaded as PDF at https://gnupg.org/documentation/manuals/gnupg.pdf You may also want to search the GnuPG mailing list archives or ask on the gnupg-users mailing list for advise on how to solve problems. Most of the new features are around for several years and thus enough public experience is available. https://wiki.gnupg.org has user contributed information around GnuPG and relate software. If you are using cleartext signatures in your application please read https://gnupg.org/blog/20251226-cleartext-signatures.html . In case of build problems specific to this release please first check https://dev.gnupg.org/T7996 for updated information. We are sorry that due to ongoing DoS on this service, you may end up at a "is under maintenance page". Please consult the archive of the gnupg-users mailing list before reporting a bug: https://gnupg.org/documentation/mailing-lists.html. We suggest to send bug reports for a new release to this list in favor of filing a bug at https://bugs.gnupg.org. If you need commercial support go to https://gnupg.com or https://gnupg.org/service.html. If you are a developer and you need a certain feature for your project, please do not hesitate to bring it to the gnupg-devel mailing list for discussion. Thanks ====== Since 2001 maintenance and development of GnuPG is done by g10 Code GmbH and has mostly been financed by donations. A team of full-time employed developers and contractors are working exclusively on GnuPG and related software like Libgcrypt, GPGME, Kleopatra, Okular, and Gpg4win. Fortunately, and this is still not common with free software, we have established a way of financing the development while keeping all our software free and freely available for everyone. Our model is similar to the way RedHat manages RHEL and Fedora: Except for the actual binary of the MSI installer for Windows and client specific configuration files, all the software is available under the GNU GPL and other Open Source licenses. Thus customers may even build and distribute their own version of the software as long as they do not use our trademarks GnuPG Desktop® or GnuPG VS-Desktop®. We like to thank all the nice people who are helping the GnuPG project, be it testing, coding, translating, suggesting, auditing, administering the servers, spreading the word, answering questions on the mailing lists, or helped with donations. *Thank you all* Your GnuPG hackers p.s. This is an announcement only mailing list. Please send replies only to the gnupg-users at gnupg.org mailing list. * List of Release Signing Keys: To guarantee that a downloaded GnuPG version has not been tampered by malicious entities we provide signature files for all tarballs and binary versions. The keys are also signed by the long term keys of their respective owners. Current releases are signed by one or more of these four keys: ed25519 2020-08-24 [SC] [expires: 2030-06-30] 6DAA 6E64 A76D 2840 571B 4902 5288 97B8 2640 3ADA Werner Koch (dist signing 2020) ed25519 2021-05-19 [SC] [expires: 2027-04-04] AC8E 115B F73E 2D8D 47FA 9908 E98E 9B2D 19C6 C8BD Niibe Yutaka (GnuPG Release Key) rsa3072 2025-05-09 [SC] [expires: 2033-03-03] 3B76 1AE4 E63B F351 9CE7 D63B ECB6 64CB E133 2EEF Alexander Kulbartsch (GnuPG Release Key) brainpoolP256r1 2021-10-15 [SC] [expires: 2029-12-31] 02F3 8DFF 731F F97C B039 A1DA 549E 695E 905B A208 GnuPG.com (Release Signing Key 2021) The keys are available at https://gnupg.org/signature_key.html and in any recently released GnuPG tarball in the file g10/distsigkey.gpg . Note that this mail has been signed by a different key. * Debian Package Signing Key: The new Debian style packages are signed using this key: ed25519 2025-07-08 [SC] [expires: 2035-07-14] 3209 7B71 9B37 45D6 E61D DA1B 85C4 5AE3 E1A2 B355 GnuPG.org Package Signing Key <[email protected]> See the package website (https://repos.gnupg.org/deb/gnupg) for a list of supported distributions and a download link for the key. -- Arguing that you don't care about the right to privacy because you have nothing to hide is no different from saying you don't care about free speech because you have nothing to say. - Edward Snowden
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