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CVE-2026-85597

8.2 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.2 · traefikNVD modified 2026-10-08 16:17

Affected (CPE criteria) 1

  • cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*

References 2