Asymmetric Resource Consumption (Amplification) Affecting ratify package, versions <1.4.0-r9


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.03% (10th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-RATIFY-14952521
  • published15 Jan 2026
  • disclosed4 Dec 2025

Introduced: 4 Dec 2025

CVE-2025-66506  (opens in a new tab)
CWE-405  (opens in a new tab)

How to fix?

Upgrade Chainguard ratify to version 1.4.0-r9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ratify package and not the ratify package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request with an (invalid) OIDC identity token in the payload containing many period characters, a call to extractIssuerURL incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This vulnerability is fixed in 1.8.3.

CVSS Base Scores

version 3.1