CVE-2025-32435: hydra Code Injection — Fix

Description

Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are owned by the hydra-queue-runner and hydra-www users respectively.

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CVSS v3.1 Score

2.6

LOW

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-95 CWE-95

Affected Products

Vendor	Product	Versions
nixos	hydra	< 2025-04-11

References

Advisories & Patches

https://github.com/NixOS/hydra/commit/8d750265135b7e203520036a742afdf301b4013f https://github.com/NixOS/hydra/security/advisories/GHSA-j7w7-965w-vjxw

Other References

https://github.com/NixOS/nixpkgs/pull/397919 https://github.com/nix-community/nix-eval-jobs/releases/tag/v2.28.1

Frequently Asked Questions

What is CVE-2025-32435? +

Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are owned by the hydra-queue-runner and hydra-www users respectively. It has a CVSS v3.1 base score of 2.6 (LOW).

How severe is CVE-2025-32435? +

CVE-2025-32435 has a CVSS v3.1 score of 2.6 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-32435? +

CVE-2025-32435 affects products from nixos, specifically: hydra. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-32435? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-32435