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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Affected Vendors & Products
References
History
Fri, 04 Sep 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict | |
| First Time appeared |
Traefik
Traefik traefik |
|
| Weaknesses | CWE-863 | |
| CPEs | cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Traefik
Traefik traefik |
|
| References |
| |
| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-04T11:30:00.783Z
Updated: 2026-09-04T11:30:00.783Z
Reserved: 2026-09-04T11:00:28.730Z
Link: CVE-2026-85597
No data.
Status : Received
Published: 2026-09-04T12:17:23.210
Modified: 2026-09-04T12:17:23.210
Link: CVE-2026-85597
No data.