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CVE-2026-71325— Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef

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公司开源的一款负载均衡器。 Traefik 2.11.54之前版本、3.0.0至3.6.25之前版本和3.7.0至3.7.10之前版本存在安全漏洞，该漏洞源于服务解析器处理TraefikService后端引用时未拒绝跨命名空间的@kubernetescrd引用，可能导致被RBAC限定在单个命名空间内的租户将自身路由器绑定到其他命名空间拥有的TraefikService，暴露或重路由该命名空间的后端，从而破坏allowCrossNamespace=false所强制的命名空间隔离

CVSS 4.8 · Medium EPSS 0.15% · P4

Affected Version Matrix 3

VendorProduct Version RangeStatus
traefik traefik < 2.11.54 affected
>= 3.0.0, < 3.6.25 affected
>= 3.7.0, < 3.7.10 affected
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I. Basic Information for CVE-2026-71325

Vulnerability Information
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Vulnerability Title
Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的划分
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 2.11.54之前版本、3.0.0至3.6.25之前版本和3.7.0至3.7.10之前版本存在安全漏洞，该漏洞源于服务解析器处理TraefikService后端引用时未拒绝跨命名空间的@kubernetescrd引用，可能导致被RBAC限定在单个命名空间内的租户将自身路由器绑定到其他命名空间拥有的TraefikService，暴露或重路由该命名空间的后端，从而破坏allowCrossNamespace=false所强制的命名空间隔离
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 < 2.11.54 -

II. Public POCs for CVE-2026-71325

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III. Intelligence Information for CVE-2026-71325

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Patches & Fixes for CVE-2026-71325 (1)

Vendor Advisories for CVE-2026-71325 (1)

Vendor Pages for CVE-2026-71325 (3)

Same Patch Batch · traefik · 2026-08-06 · 4 CVEs total

CVE-2026-71327 7.6 HIGH Traefik: Gateway API route identity collision allows cross-namespace backend hijacking
CVE-2026-71324 7.0 HIGH Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend kee
CVE-2026-71326 2.1 LOW Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-653

V. Comments for CVE-2026-71325

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