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Traefik before v2.11.55 contains a TLS option conflict resolution vulnerability that allows unauthenticated attackers to bypass client-certificate… (CVE-2026-85597)

0
High
VulnerabilityCVE-2026-85597gcveosvghsa-q42x-32f8-m4r5cve-2026-85597ghsa
Published: 09/04/2026 (09/04/2026, 12:31:00 UTC)
Source: GCVE Database

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.

CVSS v4.0

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
None
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
Scope
X
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-q42x-32f8-m4r5
Osv Schema Version
1.4.0
Aliases
["CVE-2026-85597"]
Ecosystems
[]
Database Specific Severity
HIGH
Cvss Version
4.0

Threat ID: 6a9ad4d2acd9273b49b664f0

Added to database: 09/04/2026, 14:25:22 UTC

Last updated: 09/04/2026, 21:32:14 UTC

Views: 3

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