---
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
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T05:16:43.073'
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
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.