CVE-2025-54864

MEDIUM EPSS 27.8%
Published Aug 12, 202510mo ago · Modified Jun 17, 20261w ago
6.9 CVSS 4.0
Medium
Find Similar
Published Aug 12, 2025 10mo ago
Last Modified Jun 17, 2026 1w ago

Description

Hydra is a continuous integration service for Nix based projects. Prior to commit f7bda02, /api/push-github and /api/push-gitea are called by the corresponding forge without HTTP Basic authentication. Both forges do however feature HMAC signing with a secret key. Triggering an evaluation can be very taxing on the infrastructure when large evaluations are done, introducing potential denial of service attacks on the host running the evaluator. This issue has been patched by commit f7bda02. A workaround involves blocking /api/push-github and /api/push-gitea via a reverse proxy.

CVSS Details

Base Score
6.9
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
27.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-306 Missing Authentication for Critical Function Authentication

Affected Products 1

VendorProductVersionRange
nixoshydra* <2025-08-12

References 2

  • github.com https://github.com/NixOS/hydra/commit/f7bda020c6144913f134ec616783e57817f7686f
    Patch
  • github.com https://github.com/NixOS/hydra/security/advisories/GHSA-qpq3-646c-vgx9
    PatchVendor Advisory

Remediation

  • github.com https://github.com/NixOS/hydra/commit/f7bda020c6144913f134ec616783e57817f7686f
    Patch
  • github.com https://github.com/NixOS/hydra/security/advisories/GHSA-qpq3-646c-vgx9
    PatchVendor Advisory