CVE-2026-85597
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.
- Published Sep 4, 2026
- CVSS 8.2 high
- 0.4% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available