Description
The Nix, Lix, and Guix package managers allow a bypass of build isolation in which a user can elevate their privileges to the build user account (e.g., nixbld or guixbuild). This affects Nix through 2.24.15, 2.26.4, 2.28.4, and 2.29.1; Lix through 2.91.2, 2.92.2, and 2.93.1; and Guix before 1.4.0-38.0e79d5b.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| NixOS | Nix | ≤ 2.24.15, 2.25.0 – ≤ 2.26.4, 2.27.0 – ≤ 2.28.4, 2.29.0 – ≤ 2.29.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 11 | guix | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | guix | No fix yet | — |
| Ubuntu Pro 22.04 LTS | guix | No fix yet | — |
References
- https://discourse.nixos.org/t/security-advisory-privilege-escalations-in-nix-lix-and-guix/66017
- https://lix.systems/blog/2025-06-24-lix-cves/
- https://guix.gnu.org/en/blog/2025/privilege-escalation-vulnerabilities-2025/
- https://labs.snyk.io
- https://security.snyk.io/vuln/?search=CVE-2025-46416
- https://security-tracker.debian.org/tracker/CVE-2025-46416