GHSA-RF44-J88R-HH8C Traefik: ForwardAuth identity spoofing via dot-form header alias

Summary There is a medium severity vulnerability in Traefik's handling of request headers whose name aliases another header name. Go canonicalizes header names on dashes only, so X-Auth-User, XAuthUser and X.Auth.User are three distinct headers to Traefik, while backends that derive variable name...