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CVE-2026-114635— Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme

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.

在 v2.11.58 之前的 Traefik 版本以及 v3.7.14 之前的版本中，其 SNI（服务器名称指示）检查存在身份验证绕过漏洞。当请求的 TLS 状态为 nil 时，该检查会被跳过。未经身份验证的客户端可以在 Go 1.27 构建版本上，通过 TLS 通道发送带有 伪标头的 HTTP/2 请求，从而绕过客户端证书要求，访问那些本应需要客户端证书的路由器。

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114635

Vulnerability Information
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Vulnerability Title
Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is skipped when request TLS state is nil. Unauthenticated clients can send HTTP/2 requests with the :scheme http pseudo-header over TLS on Go 1.27 builds to reach routers requiring client certificates without presenting one.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 0 ~ 2.11.58 -
traefik traefik 3.0.0 ~ 3.7.14 -

II. Public POCs for CVE-2026-114635

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-114635

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Other References for CVE-2026-114635 (2)

Same Patch Batch · traefik · 2026-10-22 · 9 CVEs total

CVE-2026-114638 8.7 HIGH Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision
CVE-2026-114640 8.7 HIGH Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Router
CVE-2026-114639 8.7 HIGH Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool
CVE-2026-114642 8.7 HIGH Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper
CVE-2026-114637 8.7 HIGH Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
CVE-2026-114636 8.7 HIGH Traefik v3.7.13 Authentication Bypass via ssl-passthrough Ingress HTTP Router
CVE-2026-114656 7.5 HIGH Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
CVE-2026-114641 3.7 LOW Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-288

V. Comments for CVE-2026-114635

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