What is GHSA-q42x-32f8-m4r5?

GHSA-q42x-32f8-m4r5 is a security advisory published by GitHub Security Advisories with High severity. Traefik before v2.11.55 contains a TLS option conflict resolution vulnerability that allows...

Which CVE IDs does GHSA-q42x-32f8-m4r5 cover?

GHSA-q42x-32f8-m4r5 covers the following CVE IDs: CVE-2026-85597. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-q42x-32f8-m4r5High

Traefik before v2.11.55 contains a TLS option conflict resolution vulnerability that allows...

Vendor

GitHub Security Advisories

Published

September 4, 2026

Last Modified

September 4, 2026

🔗 CVE IDs covered (1)

CVE-2026-85597 →

📋 Description

Traefik before v2.11.55 contains 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.

🔗 References (4)

https://github.com/traefik/traefik/security/advisories/GHSA-g55h-rg46-x9c5
https://nvd.nist.gov/vuln/detail/CVE-2026-85597
https://www.vulncheck.com/advisories/traefik-before-2.11.55-mtls-bypass-via-tls-option-conflict
https://github.com/advisories/GHSA-q42x-32f8-m4r5