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CVE-2026-114638— Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision

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 v3.7.0 至 v3.7.13 版本中，Kubernetes Ingress NGINX 提供者存在身份验证不当的漏洞。当 名称在“点号转连字符”规范化后发生冲突时，该组件会错误地合并客户端证书颁发机构（CA）。这导致持有其他主机 CA 签发的证书的攻击者能够访问本应要求专属客户端 CA 的主机，而该主机的合法客户端反而会被拒绝访问。

CVSS 8.7 · High
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I. Basic Information for CVE-2026-114638

Vulnerability Information
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Vulnerability Title
Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik v3.7.0 before v3.7.14 contains an improper authentication vulnerability in the Kubernetes Ingress NGINX provider that merges client CAs when auth-tls-secret names collide after dot-to-dash normalization. Attackers holding certificates from another host's CA can access a host requiring its own client CA, while that host's legitimate clients are refused.
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
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 3.7.0 ~ 3.7.14 -

II. Public POCs for CVE-2026-114638

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III. Intelligence Information for CVE-2026-114638

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Other References for CVE-2026-114638 (2)

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

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-2026-114635 8.7 HIGH Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
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-287

V. Comments for CVE-2026-114638

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