Medium severity · published May 5, 2026
CVE-2026-44029
An issue was discovered in Nix before 2.34.7
5.3
CVSS
0.6%
EPSS
No
On KEV
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);
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NI
Nix · NixOS
2.24.7 before 2.28.7; 2.29.0 before 2.29.4; 2.30.0 before 2.30.5; 2.31.0 before 2.31.5; 2.32.0 before 2.32.8; 2.33.0 before 2.33.6; +1 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44029
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44029
discourse.nixos.org
https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407
github.com
https://github.com/NixOS/nix/security/advisories/GHSA-gr92-w2r5-qw5p
www.openwall.com
https://www.openwall.com/lists/oss-security/2026/05/04/33
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