Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | < 2.11.55 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5ExploitMitigationPatch
- https://www.vulncheck.com/advisories/traefik-before-2.11.55-mtls-bypass-via-tls-Third Party Advisory
FAQ
What is CVE-2026-85597?
CVE-2026-85597 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 ...
How severe is CVE-2026-85597?
CVE-2026-85597 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-85597?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.