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

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...