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CVE-2026-44028

HIGH
7.5
CVSS Score
Published: May 5, 2026 at 12:30 AM UTC
Updated: October 26, 2026 at 07:10 PM UTC
2 products affected across 2 vendorsNixLix

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Severity
HIGH7.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Lix· Lix
90%
2.93.0 ≤ v < 2.93.42.94.0 ≤ v < 2.94.22.95.0 ≤ v < 2.95.22.93.02.94.02.95.0
Affected range stops below 2.93.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.94.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.95.2, so it looks safe — our inference, not a vendor statement
Nix· Nixos
90%
2.24.4 ≤ v < 2.28.72.29.0 ≤ v < 2.29.42.30.0 ≤ v < 2.30.52.31.0 ≤ v < 2.31.52.32.0 ≤ v < 2.32.82.33.0 ≤ v < 2.33.62.34.0 ≤ v < 2.34.72.24.42.29.02.30.02.31.02.32.02.33.02.34.0
Affected range stops below 2.28.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.29.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.30.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.31.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.32.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.33.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.34.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

Source: cverecord
https://discourse.nixos.org/t/security-advisory-local-privilege-escalation-in-lix-and-nix/77407
Source: cverecord
https://github.com/NixOS/nix/security/advisories/GHSA-vh5x-56v6-4368
Source: cverecord
https://www.openwall.com/lists/oss-security/2026/05/04/33
Source: cverecord
https://www.openwall.com/lists/oss-security/2026/05/04/32
Source: cverecord
https://lix.systems/blog/2026-05-05-lix-unsigned-integer-overflow/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmitre
Attack Vector
LOCAL
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-674

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