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CVE-2026-119573— Traefik 3.7.11 before 3.7.15 Cross-Namespace Authorization Bypass via auth-tls-secret

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 Traefik 3.7.11 至 3.7.15 之前的版本中，Kubernetes Ingress NGINX 提供程序存在一个授权绕过漏洞。当复用已缓存的客户端认证 TLS 选项时，该漏洞会跳过对 注解的跨命名空间检查。能够创建 Ingress 的用户可以引用其他命名空间中已被另一个 Ingress 使用的 CA 密钥，将其强制应用于自己的路由，并探测该密钥是否存在，但无法获取其内容。

CVSS 4.4 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-119573

Vulnerability Information
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Vulnerability Title
Traefik 3.7.11 before 3.7.15 Cross-Namespace Authorization Bypass via auth-tls-secret
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik 3.7.11 before 3.7.15 contains an authorization bypass in the Kubernetes Ingress NGINX provider that skips the cross-namespace check on the auth-tls-secret annotation when a cached client authentication TLS option is reused. Users who can create Ingresses can reference another namespace's CA secret already used by another Ingress, enforcing it on their own routes and learning whether it exists, without disclosure of its contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A: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 3.7.11 ~ 3.7.15 -

II. Public POCs for CVE-2026-119573

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III. Intelligence Information for CVE-2026-119573

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Other References for CVE-2026-119573 (2)

Same Patch Batch · traefik · 2026-10-30 · 3 CVEs total

CVE-2026-119572 8.7 HIGH Traefik 3.7.0-ea.1 before 3.7.15 mTLS Bypass via Ingress NGINX Provider
CVE-2026-119574 5.9 MEDIUM Traefik 3.2.0 before 3.7.15 FastProxy Data Race Denial of Service

IV. Related Vulnerabilities

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