CVE-2024-32657: Hydra is a Continuous Integration service for Nix based projects

Q: How do I fix CVE-2024-32657?

hydra: upgrade to 23.11. Exact commands for each OS are on this page.

Q: Is CVE-2024-32657 being exploited?

CVE-2024-32657 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-2024-32657 affect?

CVE-2024-32657 affects hydra. Severity is medium (CVSS 4.6). Hydra is a Continuous Integration service for Nix based projects. Attackers can execute arbitrary code in the browser context of Hydra and execute authenticated HTTP requests. The abused feature allows Nix builds to specify files that Hydra

Q: How urgent is CVE-2024-32657?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 4.6UPGRADE

CVE-2024-32657 is a medium-severity flaw (CVSS 4.6) 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. Attackers can execute arbitrary code in the browser context of Hydra and execute authenticated HTTP requests. The abused feature allows Nix builds to specify files that Hydra serves to clients. One use of this functionality is serving NixOS `.iso` files. The issue is only with html files served by Hydra. The issue has been patched on https://hydra.nixos.org around 2024-04-21 14:30

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.6 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-04-22
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

2024-04-22 23:15 UTCPublished CVE record published
2026-06-17 07:30 UTCUpdated Record last modified

nixos hydra UPGRADE

Affected: < 23.11

Fixed in: 23.11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 23.11 (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-2024-32657?

hydra: upgrade to 23.11. Exact commands for each OS are on this page.

Is CVE-2024-32657 being exploited?

CVE-2024-32657 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-2024-32657 affect?

CVE-2024-32657 affects hydra. Severity is medium (CVSS 4.6). Hydra is a Continuous Integration service for Nix based projects. Attackers can execute arbitrary code in the browser context of Hydra and execute authenticated HTTP requests. The abused feature allows Nix builds to specify files that Hydra

How urgent is CVE-2024-32657?

Priority 26/100. 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-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

References

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