---
id: CVE-2026-110451
title: >-
  Nix before 2.35.3 and Lix before 2.95.4 on macOS allow a Seatbelt sandbox
  escape (for an unconfined build) because a certain size threshold is
  mishandled.
summary: >-
  Nix before 2.35.3 and Lix before 2.95.4 on macOS allow a Seatbelt sandbox
  escape (for an unconfined build) because a certain size threshold is
  mishandled.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'
cwe:
  - CWE-863
vendor: NixOS
product: Nix
affected:
  - Nix < 2.28.8
  - Nix >= 2.29.0 < 2.30.6
  - Nix >= 2.31.0 < 2.31.6
  - Nix >= 2.32.0 < 2.34.9
  - Nix >= 2.35.0 < 2.35.3
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:56:15.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110451'
references:
  - url: >-
      https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
epss: 0.00131
epssPercentile: 0.02706
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T14:54:20.682665Z'
ingestedAt: '2026-10-14T06:17:13.781Z'
---

## Overview

Nix before 2.35.3 and Lix before 2.95.4 on macOS allow a Seatbelt sandbox escape (for an unconfined build) because a certain size threshold is mishandled.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.