GO-2025-4193 Fulcio allocates excessive memory during token parsing in github.com/sigstore/fulcio

Fulcio allocates excessive memory during token parsing in github.com/sigstore/fulcio...

GHSA-F83F-XPX7-FFPW Fulcio allocates excessive memory during token parsing

Function identity.extractIssuerURL currently 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...

CVE-2025-66506 Fulcio allocates excessive memory during token parsing

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...

CVE-2025-66506

CVE-2025-66506 affects Fulcio prior to 1.8.3. The identity.extractIssuerURL function splits the untrusted OIDC identity token on periods, which can incur O(n) memory allocations when receiving tokens with many dots. This could lead to resource consumption under malicious input. The issue is fixed...