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CVE-2026-64846

2.8 · LOW

Nix is a package manager for Linux and other Unix systems.

Published Aug 20, 2026CWE-61EPSS 0.11%

Overview

CVE-2026-64846 is a low-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 2.8 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.8, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Nix is a package manager for Linux and other Unix systems. Prior to 2.35.0, a malicious derivation executed with the recursive-nix experimental feature can exploit a time-of-check/time-of-use race involving final symlink handling in the LocalStore restore path. The race can cause writeFile to follow a substituted final symlink when opening a path with O_TRUNC instead of enforcing FinalSymlink::DontFollow, allowing the Nix process or nix-daemon to create or truncate an empty file outside the build sandbox with the daemon user's permissions. The primitive does not provide arbitrary-content writes and requires winning the race. This issue is fixed in version 2.35.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/NixOS/nix/commit/26679828f74ee6e82a4100904e6361f993ff5390GitHubgithub.com/NixOS/nix/pull/15401GitHubgithub.com/NixOS/nix/security/advisories/GHSA-6h4g-g5j9-fm5f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64846?

CVE-2026-64846 is a low-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 2.8 (LOW).

How severe is CVE-2026-64846?

This vulnerability has a CVSS 3.1 base score of 2.8, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64846?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64846?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64846 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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