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Vulnerabilities

Security fix · CVE-2025-54864

Hydra is a continuous integration service for Nix based projects.

Published Aug 12, 2025 · catalog updated Aug 12, 2025 · NixOS

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-54864. EPSS is 0.38%. Act only if a listed version of NixOS is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.38%
Remediation
Version ranges on file
Affected products
vendor NixOS hydra < f7bda020c6144913f134ec616783e57817f7686f

Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of service attacks on the host running the evaluator. This issue has been patched by commit f7bda02. A workaround involves blocking /api/push-github and /api/push-gitea via a reverse proxy.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor NixOS hydra < f7bda020c6144913f134ec616783e57817f7686f< f7bda020c6144913f134ec616783e57817f7686f

How to fix CVE-2025-54864

  • Upgrade

    CVE-2025-54864 lists a fix boundary at f7bda020c6144913f134ec616783e57817f7686f. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in < f7bda020c6144913f134ec616783e57817f7686f

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-54864. EPSS is 0.38%. Act only if a listed version of NixOS is installed.

Which versions are affected?

Compare what you have installed with NixOS hydra < f7bda020c6144913f134ec616783e57817f7686f < f7bda020c6144913f134ec616783e57817f7686f. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.38%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 12, 2025 · EUVD

    Detected

    Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of servi

  2. Aug 12, 2025 · EUVD

    Updated

    Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of servi

Sources

  • CVE.orgVulnerability recordCVE-2025-54864

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-54864

    30-day exploitation probability 0.38%

    first.org
  • EUVDVulnerability recordEUVD-2025-24265

    Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an ev

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026