CVE-2026-64846
Nix is a package manager for Linux and other Unix systems.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Nix Is A Package Manager For Linux And Other Unix Systems. | before 2.35.0 |
Versions were read from the advisory text. No structured product data has been published for this record yet.