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GO-2026-5287
github.com/traefik/traefik/v3github.com/traefik/traefik/v2Traefik's HTTP/3 TLS configuration selection is vulnerable to a bypass when using wildcard or mixed-case hosts in the SNI.
The HTTP/3 (QUIC) path performed a direct, case-sensitive lookup on the SNI value to select the applicable TLS configuration. This lookup failed to match wildcard host patterns (e.g., "*.example.com") or case variants of configured hostnames. In these cases, Traefik would fall back to the default TLS configuration, which might not enforce mutual TLS (mTLS), allowing unauthenticated clients to access protected backends.
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Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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