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CVE-2026-85597— Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik 在 v2.11.55 之前存在一个 TLS 选项冲突解决漏洞。该漏洞允许未认证的攻击者通过在多主机路由器上创建相互冲突的 TLS 选项，从而绕过客户端证书（client-certificate）认证。攻击者可以利用单个路由器规则中多个主机名之间共享的 TLS 解析机制，使严格的 mTLS（双向 TLS）要求回退到默认选项，进而访问受保护的后端服务。

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1598 · Phishing for Information

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.55 affected
2.11.55 unaffected
3.0.0≤ 3.7.12 affected
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I. Basic Information for CVE-2026-85597

Vulnerability Information
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Vulnerability Title
Traefik before v2.11.55 mTLS Bypass via TLS Option Conflict
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 0 ~ 2.11.55 -
traefik traefik 3.0.0 ~ 3.7.12 -

II. Public POCs for CVE-2026-85597

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III. Intelligence Information for CVE-2026-85597

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Vendor Advisories for CVE-2026-85597 (2)

Same Patch Batch · traefik · 2026-09-04 · 4 CVEs total

CVE-2026-85595 9.3 CRITICAL Traefik before v2.11.55 Authentication Bypass via digestAuth
CVE-2026-85596 8.2 HIGH Traefik v3.7 Authentication Bypass via TLS Option Conflict
CVE-2026-85594 7.0 HIGH Traefik v3.7.1 crossProviderNamespaces Bypass via Service Middleware

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-863

V. Comments for CVE-2026-85597

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