Vulnerability Description
An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine stack. The stack is allocated without a guard page, which means that a stack overflow could overwrite memory on the heap and could allow arbitrary code execution as the Nix daemon (run as root in multi-user installations) if ASLR hardening is bypassed. This can be exploited by all users able to connect to the daemon (e.g., in Nix, this is configurable via the allowed-users setting, defaulting to all users). 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 for Nix (introduced in 2.24.4); and 2.95.2, 2.94.2, and 2.93.4 for Lix (introduced in 2.93.0).
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-li
- https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368
- https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/
- https://www.openwall.com/lists/oss-security/2026/05/04/32
- https://www.openwall.com/lists/oss-security/2026/05/04/33
FAQ
What is CVE-2026-44028?
CVE-2026-44028 is a vulnerability with a CVSS score of 7.5 (HIGH). An issue was discovered in Nix before 2.34.7 and Lix before 2.95.2. Unbounded recursion in the NAR (Nix Archive) parser could lead to a stack-to-heap overflow when the parser is run on a coroutine sta...
How severe is CVE-2026-44028?
CVE-2026-44028 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44028?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.