CVSS 9.1 (critical) · published 2026-09-04
Traefik before v2.11.55 and v3.0.0 through v3.7.10 contain a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate authentication by creating conflicting TLS options on multi-host routers. Attackers can reach protected backends by exploiting shared TLS resolution across multiple hostnames in a single router rule, causing the strict mTLS requirement to fall back to default options for all hosts.
Affected products (NVD): traefik traefik
Fixed in (NVD): 2.11.55, 3.7.11
Weakness: CWE-863
Source: NVD CVE-2026-85597
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