---
cve: "CVE-2026-85597"
severity: "LOW"
cvss: 3.1
epss: "2.8%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-09-04 12:17:23"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T01:54:42+02:00"
---

# CVE-2026-85597

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- 1ac90fccb982f6de40f557493152bdb0c9f0a809 (Commit)

## Referenzen

- <https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5>
- <https://www.vulncheck.com/advisories/traefik-before-2.11.55-mtls-bypass-via-tls-option-conflict>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-85597) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_