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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. Join the discussion | CVE Database V5 | 08/20/2026, 16:18:06 UTC Added: 08/20/2026, 16:38:18 UTC |
CVE-2026-39860 is a critical vulnerability in the Nix package manager affecting Linux sandboxed builds. It arises from a flaw in the fix for a previous vulnerability (CVE-2024-27297) that allows arbitrary file overwrites by following symbolic links during fixed-output derivation output registration. This can be exploited by users who can submit builds to the Nix daemon, potentially leading to root privilege escalation by overwriting sensitive files. The issue does not affect sandboxed macOS builds. Multiple versions of Nix prior to specific fixed releases are vulnerable. The vulnerability has a CVSS score of 9. A fix is available in Nix versions 2.28.6, 2.29. Join the discussion | CVE Database V5 | 04/08/2026, 20:58:22 UTC Added: 04/08/2026, 21:05:48 UTC |
Nix is a package manager for Linux and other Unix systems. Builds with Nix 2.30.0 on macOS were executed with elevated privileges (root), instead of the build users. The fix was applied to Nix 2.30.1. No known workarounds are available. Join the discussion | CVE Database V5 | 07/14/2025, 20:42:12 UTC Added: 07/14/2025, 20:46:05 UTC |
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