7.1

CVE-2025-54800: nixos hydra Cross-site Scripting

CVSS: 7.1v4.0HighAnalyzed
Published 12-08-2025Last modified 12-08-2025
Open JSON

Vulnerability summary

CVE-2025-54800 is a high (CVSS 7.1) Cross-site Scripting vulnerability in nixos hydra. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.5% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v4.0 (CVE.org)
EPSS score
0.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2025
    PublishedVulnerability first disclosed.
  2. 12-08-2025
    Last modifiedVulnerability information updated.

Description

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 workaround involves either not building untrusted packages or not visiting the builds page.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

0.00 pp

From 0.20% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nixos1 product
  • hydra< dea1e168f590efb27db32dbacc82b09e15f8ae4b | < 2025-08-12

1 vendor · 1 product

References

2 links