How severe is CVE-2025-54800?

CVE-2025-54800 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-54800 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-54800?

CVE-2025-54800 affects Nixos Hydra. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-54800?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-54800 have an EU (EUVD) identifier?

Yes. CVE-2025-54800 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24268.

When was CVE-2025-54800 published?

CVE-2025-54800 was published on 2025-08-12 and last updated on 2026-06-17.

CVE-2025-54800

CVE-2025-54800 is a medium-severity vulnerability in Nixos Hydra with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 7.1
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-24268
Weakness: CWE-79
Affected product: Nixos Hydra
Published: 2025-08-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-54800?: 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.
How severe is CVE-2025-54800?: CVE-2025-54800 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-54800 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-54800?: CVE-2025-54800 affects Nixos Hydra. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-54800?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-54800 have an EU (EUVD) identifier?: Yes. CVE-2025-54800 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-24268.
When was CVE-2025-54800 published?: CVE-2025-54800 was published on 2025-08-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nixos:hydra:*:*:*:*:*:*:*:*

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