CVE-2026-110453: CWE-863 Incorrect Authorization in NixOS Nix
Description
CVE-2026-110453 is an authorization vulnerability in NixOS Nix versions before 2.35.3. When running unsandboxed on macOS or FreeBSD, it incorrectly allows build users to make connections from daemon clients. This flaw could lead to unauthorized actions by build users. The vulnerability has a medium severity with a CVSS score of 4.3.
CVSS v3.1
Score 4.3medium
Affected software
NixOS
Nix
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Nix versions prior to 2.35.3, when operating unsandboxed on macOS or FreeBSD, contain an incorrect authorization flaw (CWE-863) that permits build users to establish connections from daemon clients improperly. This issue affects multiple version ranges: >=0 <2.28.8, >=2.29.0 <2.30.6, >=2.31.0 <2.31.6, >=2.32.0 <2.34.9, and >=2.35.0 <2.35.3. The vulnerability does not impact confidentiality or availability but can lead to integrity loss due to unauthorized actions by build users.
Potential Impact
The vulnerability allows unauthorized connections by build users from daemon clients, potentially enabling unauthorized integrity-impacting actions. There is no impact on confidentiality or availability. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in Nix version 2.35.3 and later. Users should upgrade to version 2.35.3 or newer to remediate this vulnerability. No vendor advisory content was provided, so patch status is inferred from the version ranges indicating fixed versions. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-14T04:15:46.477Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acf06312cdf04f6563e800f
Added to database: 10/14/2026, 04:33:53 UTC
Last enriched: 10/14/2026, 04:49:04 UTC
Last updated: 10/14/2026, 04:49:04 UTC
Views: 4
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