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CVE-2026-65601— Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef

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公司开源的一款反向代理与负载均衡工具。 Traefik 3.7.0至3.7.6版本存在授权问题漏洞，该漏洞源于Kubernetes Gateway API提供程序中的命名空间混淆问题，解析HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef时，使用了后端Service命名空间而非HTTPRoute命名空间，可能导致低权限路由作者绑定后端命名空间中的Traefik中间件，从而向下游请求注入可信的反向代理身份标头。

CVSS 5.3 · Medium EPSS 0.51% · P44

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik 3.7.0< 3.7.7 affected
3.7.7 unaffected
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I. Basic Information for CVE-2026-65601

Vulnerability Information
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Vulnerability Title
Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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公司开源的一款反向代理与负载均衡工具。 Traefik 3.7.0至3.7.6版本存在授权问题漏洞，该漏洞源于Kubernetes Gateway API提供程序中的命名空间混淆问题，解析HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef时，使用了后端Service命名空间而非HTTPRoute命名空间，可能导致低权限路由作者绑定后端命名空间中的Traefik中间件，从而向下游请求注入可信的反向代理身份标头。
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 3.7.0 ~ 3.7.7 -

II. Public POCs for CVE-2026-65601

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III. Intelligence Information for CVE-2026-65601

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Patches & Fixes for CVE-2026-65601 (1)

Vendor Advisories for CVE-2026-65601 (2)

Same Patch Batch · traefik · 2026-07-22 · 3 CVEs total

CVE-2026-65600 7.8 HIGH Traefik before v2.11.52 Authentication Bypass via ReplacePathRegex
CVE-2026-65602 5.3 MEDIUM Traefik before 3.6.23 IngressRouteTCP ServersTransport Namespace Bypass

IV. Related Vulnerabilities

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