VULNERABILITY INTELLIGENCE

CVE-2026-85597

CVSS score8.2 HIGH
EPSS probability0.35%
CISA KEVNot currently listed
Published2026-09-04
Last modified2026-10-08
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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.

Weakness classification

  • CWE-863: Incorrect Authorization

Primary references