Critical severity9.1NVD Advisory· Published Sep 4, 2026· Updated Oct 8, 2026
CVE-2026-85597
CVE-2026-85597
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.
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Affected products
1Patches
Vulnerability mechanics
References
2- github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5nvdExploitMitigationPatchVendor Advisory
- www.vulncheck.com/advisories/traefik-before-2.11.55-mtls-bypass-via-tls-option-conflictnvdThird Party Advisory
News mentions
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