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CVE-2026-85597— Traefik before v2.11.55 and v3.0.0 through v3.7.10 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是Traefik公司开源的一款负载均衡器。 Traefik 2.11.55之前版本和3.0.0版本至3.7.10版本存在授权问题漏洞，该漏洞源于TLS选项冲突解析问题，可能导致未经身份验证的攻击者绕过客户端证书认证并访问受保护的后端。

CVSS 8.2 · High EPSS 0.35% · P29

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≤ 3.7.10 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 and v3.0.0 through v3.7.10 mTLS Bypass via TLS Option Conflict
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
Vulnerability Title
Traefik 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 2.11.55之前版本和3.0.0版本至3.7.10版本存在授权问题漏洞，该漏洞源于TLS选项冲突解析问题，可能导致未经身份验证的攻击者绕过客户端证书认证并访问受保护的后端。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 0 ~ 2.11.55 -
traefik traefik 3.0.0 ~ 3.7.10 -

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 and v3.0.0 through v3.7.10 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