GO-2026-5853 Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage in github.com/sigstore/fulcio

Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage in github.com/sigstore/fulcio...

Medium: runfinch-finch

Issue Overview: Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect OIDC identity. Prior to 1.8.5, Fulcio's metaRegex function uses unanchored regex, allowing attackers to bypass MetaIssuer URL validation and trigger SSRF to arbitrary internal services...

GO-2026-4311 Fulcio is vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass in github.com/sigstore/fulcio

Fulcio is vulnerable to Server-Side Request Forgery SSRF via MetaIssuer Regex Bypass in github.com/sigstore/fulcio...

CVE-2026-22772 Fulcio vulnerable to Server-Side Request Forgery (SSRF) via MetaIssuer Regex Bypass

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect OIDC identity. Prior to 1.8.5, Fulcio's metaRegex function uses unanchored regex, allowing attackers to bypass MetaIssuer URL validation and trigger SSRF to arbitrary internal services. Since the SSRF on...