Bug 2528835 (CVE-2026-85597) - CVE-2026-85597 github.com/traefik/traefik: Traefik: Authentication bypass via TLS option conflict
Summary: CVE-2026-85597 github.com/traefik/traefik: Traefik: Authentication bypass via...
Keywords:
Status: NEW
Alias: CVE-2026-85597
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-04 18:22 UTC by OSIDB Bzimport
Modified: 2026-09-10 14:23 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-04 18:22:11 UTC 
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.
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