Vulnerability · Published May 5, 2026 · Assigned by mitre
CVE-2026-44029
Medium 5.3
In plain English
A medium-severity security flaw in Nix from NixOS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 52.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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);
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | nix | no fix listed | DEBIAN-CVE-2026-44029 |
| Debian:14 | nix | 2.34.8+dfsg-1 | DEBIAN-CVE-2026-44029 |
| Ubuntu:25.10 | nix | no fix listed | UBUNTU-CVE-2026-44029 |
| Ubuntu:26.04:LTS | nix | no fix listed | UBUNTU-CVE-2026-44029 |
| Ubuntu:26.10 | nix | no fix listed | UBUNTU-CVE-2026-44029 |
Affected products (as reported)
Weakness: CWE-36 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N