Asymmetric Resource Consumption (Amplification) Affecting slsa-verifier package, versions <2.7.1-r6


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.05% (15th percentile)

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  • Snyk IDSNYK-WOLFILATEST-SLSAVERIFIER-15414425
  • published5 Mar 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 Wolfi slsa-verifier to version 2.7.1-r6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream slsa-verifier package and not the slsa-verifier package as distributed by Wolfi. See How to fix? for Wolfi 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