Source: nix Version: 2.34.8+dfsg-1 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for nix. CVE-2026-64846[0]: | Nix is a package manager for Linux and other Unix systems. Prior to | 2.35.0, a malicious derivation executed with the recursive-nix | experimental feature can exploit a time-of-check/time-of-use race | involving final symlink handling in the LocalStore restore path. The | race can cause writeFile to follow a substituted final symlink when | opening a path with O_TRUNC instead of enforcing | FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to | create or truncate an empty file outside the build sandbox with the | daemon user's permissions. The primitive does not provide arbitrary- | content writes and requires winning the race. This issue is fixed in | version 2.35.0. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-64846 https://www.cve.org/CVERecord?id=CVE-2026-64846 [1] https://github.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f [2] https://github.com/NixOS/nix/pull/15401 [3] https://github.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
