CVE-2026-44028

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Summary

CVECVE-2026-44028
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-05 01:16:06 UTC
Updated2026-05-05 01:16:06 UTC
DescriptionAn 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).

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Problem Types: CWE-674 | CWE-674 CWE-674 Uncontrolled Recursion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNACVSS7.5HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NixOS Nix affected 2.24.4 2.28.7 semver Not specified
CNA NixOS Nix affected 2.29.0 2.29.4 semver Not specified
CNA NixOS Nix affected 2.30.0 2.30.5 semver Not specified
CNA NixOS Nix affected 2.31.0 2.31.5 semver Not specified
CNA NixOS Nix affected 2.32.0 2.32.8 semver Not specified
CNA NixOS Nix affected 2.33.0 2.33.6 semver Not specified
CNA NixOS Nix affected 2.34.0 2.34.7 semver Not specified
CNA Lix Project Lix affected 2.93.0 2.93.4 semver Not specified
CNA Lix Project Lix affected 2.94.0 2.94.2 semver Not specified
CNA Lix Project Lix affected 2.95.0 2.95.2 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/05/04/32 [email protected] www.openwall.com
discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix... [email protected] discourse.nixos.org
www.openwall.com/lists/oss-security/2026/05/04/33 [email protected] www.openwall.com
github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368 [email protected] github.com
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