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CVE-2026-41174— Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding

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开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在安全漏洞，该漏洞源于Kubernetes CRD提供程序跨命名空间隔离执行不完整，未对Chain中间件内嵌套的中间件引用应用限制，可能导致绕过隔离边界。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.27% · P18

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik < 2.11.43 affected
>= 3.7.0-ea.1, < 3.7.0-rc.2 affected
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I. Basic Information for CVE-2026-41174

Vulnerability Information
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Vulnerability Title
Traefik Kubernetes CRD allows unauthorized cross-namespace middleware binding
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik开源的一款反向代理与负载均衡工具。 Traefik 2.11.43之前版本、3.6.14之前版本和3.7.0-rc.2之前版本存在安全漏洞，该漏洞源于Kubernetes CRD提供程序跨命名空间隔离执行不完整，未对Chain中间件内嵌套的中间件引用应用限制，可能导致绕过隔离边界。
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 < 2.11.43 -

II. Public POCs for CVE-2026-41174

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III. Intelligence Information for CVE-2026-41174

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Patches & Fixes for CVE-2026-41174 (1)

Vendor Advisories for CVE-2026-41174 (1)

Vendor Pages for CVE-2026-41174 (3)

Same Patch Batch · traefik · 2026-04-30 · 5 CVEs total

CVE-2026-41263 Traefik: BasicAuth middleware: timing side-channel vulnerability
CVE-2026-35051 Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass
CVE-2026-39858 Traefik: Forwarded alias spoofing top pre-auth decision bypass
CVE-2026-40912 Traefik: StripPrefixRegex auth bypass via Path/RawPath desync

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41174

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