nix: Nix is a package manager for Linux and other Unix systems
CVE-2026-64846 is fixed in nix on 1 platform by DEBIAN-CVE-2026-64846 (version 2.35.4+dfsg-1), released August 20, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nix · Debian 14 | 2.35.4+dfsg-1 | DEBIAN-CVE-2026-64846 | Aug 20, 2026 |
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