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CVE-2026-85597Traefik before v2.11.55 and v3.0.0 through v3.7.10 mTLS Bypass via TLS Option Conflict
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.
8.2 HIGHEPSS 0.35%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.2 | HIGH | 4.0VulnCheck (CNA) | 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 |
| 9.1 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Details
- CVE ID
- CVE-2026-85597
- Status
- Analyzed
- Assigner (CNA)
- VulnCheck
- Published
- Sep 4, 2026
- Last modified
- 2026-10-08 16:17 UTC
- Weaknesses
- CWE-863 · Incorrect Authorization
Affected Products
As published by the CNA in the CVE record.
traefiktraefik1 version range
- before 2.11.55
traefiktraefik1 version range
- 3.0.0 through 3.7.10