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CVE-2026-44029

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-05 · updated 2026-10-26
• Weakness: CWE-36

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 products

• NixOS Nix: from 2.24.7 before 2.28.7; from 2.29.0 before 2.29.4; from 2.30.0 before 2.30.5; from 2.31.0 before 2.31.5; from 2.32.0 before 2.32.8; from 2.33.0 before 2.33.6 — fixed in 2.28.7, 2.29.4, 2.30.5, 2.31.5, 2.32.8, 2.33.6

How to fix

Upgrade to a fixed version: NixOS Nix 2.28.7, 2.29.4, 2.30.5, 2.31.5. Check the vendor advisory for mitigations.

References

• https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407
• https://github.com/NixOS/nix/security/advisories/GHSA-gr92-w2r5-qw5p
• https://www.openwall.com/lists/oss-security/2026/05/04/33

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