CVE-2026-42183

CVE-2026-42183 affects Argo Workflows (versions 4.0.0–4.0.4) where a nil pointer dereference in server/auth/gatekeeper.go rbacAuthorization() can cause a denial of service for SSO users when SSO_DELEGATE_RBAC_TO_NAMESPACE is true. The issue arises for claims matching a namespace-level RBAC rule b...