Traefik: SNICheck ignores wildcard TLSOptions mappings in github.com/traefik/traefik
The SNICheck middleware in Traefik ignores wildcard TLSOptions mappings, allowing an unauthenticated attacker to bypass mTLS requirements by using a domain-fronted request. This occurs because the middleware compares the TLS options name used during the handshake with a pre-computed value that may not account for wildcard matches correctly when certain configuration models are applied.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-48491US | critical10.0OT elevated | — | ||
Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection (SNICheck) that allows an… | ||||
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references
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