CVE-2026-71326

CVE-2026-71326 affects Traefik’s BasicAuth middleware (pkg/middlewares/auth/basic_auth.go) in 3.6.11–3.6.25 and 3.7.10. The vulnerability arises from deduplicating concurrent password checks using a singleflight key built from the delimiter-free concatenation of password and secret, enabling an a...

CVE-2026-41263 Traefik: BasicAuth middleware: timing side-channel vulnerability

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to ho...

Traefik: A timing side-channel vulnerability allows for valid username enumeration via BasicAuth middleware

Summary There is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-tim...