CVE-2026-44028: Nix · CWE-674
Source GCVE Database
Not known to be exploited · CVSS 7.5 High · fixed in 2.34.7 : patch Nix soon.
Data as of 27 Oct 2026, 03:40 UTC
- Patch
- Available – fixed in 2.34.7, 2.33.6, 2.32.8 +7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 5 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| NixOSNix | Affected
| Fixed in
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| NixOSNix | Affected
| Fixed in
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| NixOSNix | Affected
| Fixed in
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| NixOSNix | Affected
| Fixed in
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| NixOSNix | Affected
| Fixed in
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| NixOSNix | Affected
| Fixed in
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AI-suggested
Upgrade Nix to version 2.34.7 or later, or one of the other fixed versions listed (2.33.6, 2.32.8, 2.31.5, 2.30.5, 2.29.4, 2.28.7). For Lix, upgrade to 2.95.2 or later (including 2.94.2, 2.93.4). Restrict access to the Nix daemon by configuring the allowed-users setting to limit which users can connect, reducing the attack surface. These updates contain fixes that prevent the unbounded recursion and stack overflow.
Description
A vulnerability in Nix before 2.34.7 and Lix before 2.95.2 involves unbounded recursion in the NAR parser, leading to a stack-to-heap overflow when run on a coroutine stack. This overflow can overwrite heap memory and potentially allow arbitrary code execution as the Nix daemon, which runs as root in multi-user setups. The flaw affects users able to connect to the daemon, with default settings allowing all users. Fixed versions have been released for both Nix and Lix.
References
- github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-44028 (opens in a new tab)
- discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407 (opens in a new tab)
- lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow (opens in a new tab)
- openwall.com/lists/oss-security/2026/05/04/32 (opens in a new tab)
- openwall.com/lists/oss-security/2026/05/04/33 (opens in a new tab)