CVE-2026-44028
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…
- Published
- Updated
- Reserved
- Assigned by
- mitre
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).
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| mitreCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected 2.24.4 – < 2.28.7
- affected 2.29.0 – < 2.29.4
- affected 2.30.0 – < 2.30.5
- affected 2.31.0 – < 2.31.5
- affected 2.32.0 – < 2.32.8
- affected 2.33.0 – < 2.33.6
- affected 2.34.0 – < 2.34.7
- affected 2.93.0 – < 2.93.4
- affected 2.94.0 – < 2.94.2
- affected 2.95.0 – < 2.95.2
References (5)
- https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407 (opens in a new tab)
- https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368 (opens in a new tab)
- https://www.openwall.com/lists/oss-security/2026/05/04/33 (opens in a new tab)
- https://www.openwall.com/lists/oss-security/2026/05/04/32 (opens in a new tab)
- https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-44028)Record last updated .