CVE-2026-44029 Details
Description
An issue was discovered in Nix before 2.34.7. Writing to arbitrary files can occur via "nix-prefetch-url --unpack" or "nix store prefetch-file --unpack" directory traversal. The fixed versions are 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, and 2.28.7 (introduced in 2.24.7);
A buffer overflow vulnerability has been identified in Nix versions prior to 2.34.7 and in Lix versions 2.93.0 and prior. This vulnerability allows local attackers to execute arbitrary code as the daemon user, which is root in multi-user installations. The issue arises in the Nix daemon when it unpacks archives containing absolute paths, leading to directory traversal and the potential for writing to arbitrary files. This vulnerability requires access to the Nix daemon and the use of ASLR weakening techniques to exploit effectively.
Users can upgrade to Nix versions 2.34.7, 2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, or 2.28.7. For Lix, the fixed versions are 2.93.4, 2.94.2, or 2.95.2.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 5, 2026CISA-ADP
Assessed May 5, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407 | [email protected] | AdvisoryBundleVendor |
| https://github.com/NixOS/nix/security/advisories/GHSA-gr92-w2r5-qw5p | [email protected] | AdvisoryRemedyVendor |
| https://www.openwall.com/lists/oss-security/2026/05/04/33 | [email protected] | Mailing ListBundle |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-36 | Absolute Path Traversal | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Nix | >= 2.24.4 (semver) |
CPE
Remediation
| |
| Lix | >= 2.93.0 (semver) |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 5, 2026 | New CVE Received | [email protected] |