CVE-2025-54800: Hydra is a continuous integration service for Nix based projects

Q: How do I fix CVE-2025-54800?

hydra: upgrade to 2025-08-12. Exact commands for each OS are on this page.

Q: Is CVE-2025-54800 being exploited?

CVE-2025-54800 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-54800 affect?

CVE-2025-54800 affects hydra. Severity is medium (CVSS 6.1). Hydra is a continuous integration service for Nix based projects. Prior to commit dea1e16, a malicious package can introduce arbitrary JavaScript code into the Hydra database that is automatically evaluated in a client's browser when anyone

Q: How urgent is CVE-2025-54800?

Priority 24/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2025-54800 is a medium-severity flaw (CVSS 6.1) affecting hydra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hydra is a continuous integration service for Nix based projects. Prior to commit dea1e16, a malicious package can introduce arbitrary JavaScript code into the Hydra database that is automatically evaluated in a client's browser when anyone visits the build page. This could be done by a third-party project as part of its build process. This also happens in other places like with hydra-release-name. This issue has been patched by commit dea1e16. A

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-79
Published	2025-08-12
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nixos

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-12 16:15 UTCPublished CVE record published
2026-06-17 09:40 UTCUpdated Record last modified

nixos hydra UPGRADE

Affected: < 2025-08-12

Fixed in: 2025-08-12

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hydra || rpm -q hydra || hydra --version

2. UPGRADE to 2025-08-12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hydra

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hydra

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-54800?

hydra: upgrade to 2025-08-12. Exact commands for each OS are on this page.

Is CVE-2025-54800 being exploited?

CVE-2025-54800 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-54800 affect?

CVE-2025-54800 affects hydra. Severity is medium (CVSS 6.1). Hydra is a continuous integration service for Nix based projects. Prior to commit dea1e16, a malicious package can introduce arbitrary JavaScript code into the Hydra database that is automatically evaluated in a client's browser when anyone

How urgent is CVE-2025-54800?

Priority 24/100. No elevated risk signals yet.

Related CVEs

CVE-2026-33504 HIGH 7.2 UPGRADE Ory Hydra is an OAuth 2.0 Server and OpenID Connect Provider
CVE-2025-54864 HIGH 7.5 UPGRADE Hydra is a continuous integration service for Nix based projects
CVE-2025-32435 LOW 2.6 UPGRADE Hydra is a Continuous Integration service for Nix based projects
CVE-2024-45049 HIGH 7.5 UPGRADE Hydra is a Continuous Integration service for Nix based projects
CVE-2024-32657 MEDIUM 4.6 UPGRADE Hydra is a Continuous Integration service for Nix based projects

References

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