CVE-2026-39860

Vulnerability overview

Nix is a package manager for Linux and other Unix systems. A bug in the fix for CVE-2024-27297 allowed for arbitrary overwrites of files writable by the Nix process orchestrating the builds (typically the Nix daemon running as root in multi-user installations) by following symlinks during fixed-output derivation output registration. This affects sandboxed Linux builds - sandboxed macOS builds are unaffected. The location of the temporary output used for the output copy was located inside the build chroot. A symlink, pointing to an arbitrary location in the filesystem, could be created by th...

Affected product and versions

Product

NixOS nix, linux kernel

Affected versions

>= >= 2.21, < 2.28.6, >= >= 2.29.0, < 2.29.3, >= >= 2.30.0, < 2.30.4, >= >= 2.31.0, < 2.31.4, >= >= 2.32.0, < 2.32.7, >= >= 2.33.0, < 2.33.4, >= >= 2.34.0, < 2.34.5, >= >= 2.20.5, <= 2.20.9, >= >= 2.19.4, <= 2.19.7, >= >= 2.18.2, <= 2.18.9, >= 2.18.2 <= 2.18.9, >= 2.19.4 <= 2.19.7, >= 2.20.5 <= 2.20.9, >= 2.21.0 < 2.28.6, >= 2.29.0 < 2.29.3, >= 2.30.0 < 2.30.4, >= 2.31.0 < 2.31.4, >= 2.32.0 < 2.32.7, >= 2.33.0 < 2.33.4, >= 2.34.0 < 2.34.5

Fixed versions

2.28.6, 2.29.3, 2.30.4, 2.31.4, 2.32.7, 2.33.4, 2.34.5

Technical data

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CWE

CWE-61