Withdrawn by the publisher.

Affected: CleanStart: kyverno

Multiple security vulnerabilities affect the kyverno package. These issues are resolved in later releases. See references for individual vulnerability details.

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.

Affected: Go: github.com/sigstore/fulcio

## Impact

Three security vulnerabilities were identified in the OIDC Discovery client:

1. **Blind Server-Side Request Forgery (SSRF) via Cross-Host Redirects**: Fulcio uses an HTTP client to fetch OIDC discovery metadata (`/.well-known/openid-configuration`). Prior to this fix, if a configured issuer returned an HTTP redirect to a different host, the client followed it by default. This allowed a compromised or malicious issuer to redirect Fulcio's discovery requests to internal-only systems, resulting in blind SSRF.

2. **JWKS Substitution and Cache Poisoning**: Because cross-host redirects were permitted during OIDC discovery, an attacker could manipulate the discovery flow to return a malicious `jwks_uri` pointing to an attacker-controlled host. When Fulcio successfully initialized the provider and cached the resulting verifier in the verifier cache, it poisoned the cache with the attacker's verification keys. The attacker could then present signatures validated against the poisoned keys.

3. **Kubernetes ServiceAccount Token Leakage**: Fulcio mounts an in-cluster Kubernetes ServiceAccount token to authenticate OIDC discovery requests sent to the local control plane API server (`https://kubernetes.default.svc`). * **Cross-Host Redirects & JWKS**: The token was previously attached globally by the transport, leaking it to third-party hosts if the issuer performed a redirect or if the `jwks_uri` pointed to a different domain. * **Wildcard MetaIssuers**: If a…

brace-expansion: Brace-expansion: Denial of Service due to exponential-time complexity github.com/jackc/pgx: golang: pgx: SQL injection via specific SQL query conditions github.com/sigstore/fulcio: Fulcio: Server-Side Request Forgery and Kubernetes ServiceAccount token leakage dompurify: DOMPurify: Cross-site scripting vulnerability allows code execution oras-go: Oras-go: Information disclosure and arbitrary file access via crafted tarball hardlinks github.com/containerd/containerd: containerd: Host-root command execution via unvalidated image config labels in CRI plugin github.com/containerd/containerd: containerd: Security bypass via Container Device Interface (CDI) annotation smuggling during checkpoint restoration. js-yaml: js-yaml: Denial of Service via crafted YAML documents

Affected: Ubuntu:26.04:LTS: golang-github-sigstore-fulcio

Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.