Nix before 2.35.3 and Lix before 2.95.4 have an integer overflow and resultant out-of-bounds write when evaluating untrusted expressions because list allocation is mishandled.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00249.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
NixOS Nix unaffected
Version Status Constraints
0 affected < 2.28.8
2.29.0 affected < 2.30.6
2.31.0 affected < 2.31.6
2.32.0 affected < 2.34.9
2.35.0 affected < 2.35.3

No data.

No data.

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Project Subscriptions

Vendors Products
Nixos Subscribe
Nix Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547 cve-icon cve-icon
History

Wed, 14 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Title Integer Overflow and Out-of-Bounds Write in Nix and Lix During Untrusted Expression Evaluation

Wed, 14 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 14 Oct 2026 04:45:00 +0000

Type Values Removed Values Added
First Time appeared Nixos
Nixos nix
CPEs cpe:2.3:a:nixos:nix:*:*:*:*:*:*:*:*
Vendors & Products Nixos
Nixos nix

Wed, 14 Oct 2026 04:15:00 +0000

Type Values Removed Values Added
Description Nix before 2.35.3 and Lix before 2.95.4 have an integer overflow and resultant out-of-bounds write when evaluating untrusted expressions because list allocation is mishandled.
Weaknesses CWE-190
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-10-14T14:22:22.609Z

Reserved: 2026-10-14T03:59:10.591Z

Link: CVE-2026-110449

cve-icon Vulnrichment

Updated: 2026-10-14T14:22:17.515Z

cve-icon NVD

Status : Received

Published: 2026-10-14T04:18:17.317

Modified: 2026-10-14T15:17:09.320

Link: CVE-2026-110449

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-14T16:45:04Z

Weaknesses