Asymmetric Resource Consumption (Amplification) Affecting golang-github-sigstore-fulcio package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-GOLANGGITHUBSIGSTOREFULCIO-14193192
- published6 Dec 2025
- disclosed4 Dec 2025
Introduced: 4 Dec 2025
NewCVE-2025-66506 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable golang-github-sigstore-fulcio.
NVD Description
Note: Versions mentioned in the description apply only to the upstream golang-github-sigstore-fulcio package and not the golang-github-sigstore-fulcio package as distributed by Debian.
See How to fix? for Debian:unstable 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.