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PatchSiren cyber security CVE debrief

CVE-2026-110451 NixOS CVE debrief

CVE-2026-110451 is a medium-severity vulnerability affecting Nix before 2.35.3 and Lix before 2.95.4 on macOS, allowing a Seatbelt sandbox escape for an unconfined build due to mishandling of a certain size threshold. This vulnerability has the potential to impact organizations that use Nix and Lix on macOS, particularly those with unconfined builds. The vulnerability's severity and potential impact make it essential for defenders to assess exposure and prioritize verification and remediation efforts.

Vendor
NixOS
Product
Nix
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Defenders responsible for Nix and Lix deployments on macOS should assess exposure and prioritize verification and remediation efforts. This includes verifying and upgrading to patched versions of Nix and Lix, assessing exposure in environments, and implementing compensating controls where necessary. Additionally, security teams and vulnerability management teams should be aware of the potential risks and take steps

Why it matters

CVE-2026-110451 is a medium-severity vulnerability affecting Nix and Lix on macOS, allowing a Seatbelt sandbox escape. Defenders should prioritize verification, remediation, and compensating controls.

  • Verify and upgrade Nix and Lix to patched versions to prevent potential sandbox escapes
  • Assess exposure in environments to determine potential impact
  • Implement compensating controls where necessary to mitigate potential risks

Technical summary

The vulnerability allows a Seatbelt sandbox escape for an unconfined build in Nix before 2.35.3 and Lix before 2.95.4 on macOS due to mishandling of a certain size threshold. This vulnerability affects Nix and Lix deployments on macOS, particularly those with unconfined builds. Defenders should prioritize verifying and upgrading to patched versions of Nix and Lix, assessing exposure in their environments, and implementing compensating controls where necessary.

Defensive priority

Defenders should prioritize verifying and upgrading to patched versions of Nix and Lix, assessing exposure in their environments, and implementing compensating controls where necessary.

Recommended defensive actions

  • Verify and upgrade Nix and Lix to patched versions
  • Assess exposure in environments
  • Implement compensating controls where necessary

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, affected versions, and references to additional information.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-110451 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-110451

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-110451 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-110451

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-110451

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/110xxx/CVE-2026-110451.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://discourse.nixos.org/t/security-advisory-for-nix-and-lix-october-2026/80547

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.