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Traefik (V3.4.2 - V3.6)

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critical advisory

Traefik HTTP/3 Backend Authentication Bypass via Connection Reuse

Traefik fails to isolate connection-bound NTLM and Negotiate authentication on HTTP/3 routes, allowing unrelated clients to inherit victim-authenticated backend connections.

Traefik +3 vulnerability auth-bypass webserver proxy request-smuggling authorization-bypass
1r 2t 1c