CVE-2025-32435: Hydra is a Continuous Integration service for Nix based projects

Q: How do I fix CVE-2025-32435?

hydra: upgrade to 2025-04-11. Exact commands for each OS are on this page.

Q: Is CVE-2025-32435 being exploited?

CVE-2025-32435 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-2025-32435 affect?

CVE-2025-32435 affects hydra. Severity is low (CVSS 2.6). Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are own

Q: How urgent is CVE-2025-32435?

Priority 16/100. No elevated risk signals yet.

Routine

LOW 2.6UPGRADE

CVE-2025-32435 is a low-severity flaw (CVSS 2.6) 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. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are owned by the hydra-queue-runner and hydra-www users respectively.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.6 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 71%)
CISA exploited list	No
Weakness	CWE-95
Published	2025-04-15
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

2025-04-15 23:15 UTCPublished CVE record published
2026-06-17 09:11 UTCUpdated Record last modified

nixos hydra UPGRADE

Affected: < 2025-04-11

Fixed in: 2025-04-11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2025-04-11 (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-2025-32435?

hydra: upgrade to 2025-04-11. Exact commands for each OS are on this page.

Is CVE-2025-32435 being exploited?

CVE-2025-32435 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-2025-32435 affect?

CVE-2025-32435 affects hydra. Severity is low (CVSS 2.6). Hydra is a Continuous Integration service for Nix based projects. Evaluation of untrusted non-flake nix code could potentially access secrets that are accessible by the hydra user/group. This should not affect the signing keys, that are own

How urgent is CVE-2025-32435?

Priority 16/100. 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-2025-54800 MEDIUM 6.1 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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