CVE-2026-44029

Directory Traversal in Nix Prefetch Commands Allowing Local Arbitrary File Write

Published May 5, 2026 CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

NixOS

Nix

unaffected

Version	Status	Constraints
`2.24.7`	affected	< 2.28.7
`2.29.0`	affected	< 2.29.4
`2.30.0`	affected	< 2.30.5
`2.31.0`	affected	< 2.31.5
`2.32.0`	affected	< 2.32.8
`2.33.0`	affected	< 2.33.6
`2.34.0`	affected	< 2.34.7

No data.

Vendor Product Versions

Nixos

Nix

Version	Status	Scheme	Platform
`[2.24.7,2.28.7)`	affected	semver	—
`[2.29.0,2.29.4)`	affected	semver	—
`[2.30.0,2.30.5)`	affected	semver	—
`[2.31.0,2.31.5)`	affected	semver	—
`[2.32.0,2.32.8)`	affected	semver	—
`[2.33.0,2.33.6)`	affected	semver	—
`[2.34.0,2.34.7)`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.573% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
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

History

May 5, 2026 1:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

May 5, 2026 3:00 AM Title updated View changes

Type	Values Removed	Values Added
Title		Directory Traversal in Nix Prefetch Commands Allowing Local Arbitrary File Write

May 5, 2026 1:15 AM Description updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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);
First Time appeared		Nixos Nixos nix
Weaknesses		CWE-36
CPEs		cpe:2.3:a:nixos:nix::::::::
Vendors & Products		Nixos Nixos nix
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
Metrics		cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}`