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TI-2024-30161 Aliases CVE-2024-45049

Nix Hydra Missing authentication when triggering evaluations

Priority MEDIUM 40CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00619 49th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NixOShydra< f73043378907c2c7e44f633ad764c8bdd1c947d5—No fix listedCNA
  • hydra VendorNixOS Affected < f73043378907c2c7e44f633ad764c8bdd1c947d5 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nixos:hydra:*:*:*:*:*:*:*:*before 2024-08-27VulnerableNixOS
  • cpe:2.3:a:nixos:hydra:*:*:*:*:*:*:*:* Versions before 2024-08-27 Vulnerable ·NixOS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-45049

References

Patch 3

Advisory 1

  • TI-2025-34598 Hydra missing authentication when triggering evaluations through GitHub and Gitea plugins CVSS 4.0MEDIUM 6.9
  • TI-2025-34554 Hydra persistent XSS in build metrics CVSS 4.0HIGH 7.1
  • TI-2024-21538 Hydra has persistent XSS vulnerability serving HTML build outputs CVSS 3.1MEDIUM 5.4
  • TI-2025-23506 Hydra no restricted eval after nix-eval-jobs migration CVSS 3.1LOW 2.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences