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CVE-2026-71327— Traefik: Gateway API route identity collision allows cross-namespace backend hijacking

Quick assessment

Affected
traefik traefik
Exploitation
Public or AI PoC available; prioritize validation
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 3.0.0版本至3.6.25之前版本和3.7.0版本至3.7.10之前版本存在处理逻辑错误漏洞，该漏洞源于pkg/provider/kubernetes/gateway/目录下的httproute.go、grpcroute.go、tcproute.go和tlsroute.go文件中，Kubernetes Gateway API provider在构建HTTPRoute、GRPCRoute、TCPRoute和TLSRoute路由及服务

CVSS 7.6 · High EPSS 0.48% · P39

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
traefik traefik >= 3.0.0, < 3.6.25 affected
>= 3.7.0, < 3.7.10 affected
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I. Basic Information for CVE-2026-71327

Vulnerability Information
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Vulnerability Title
Traefik: Gateway API route identity collision allows cross-namespace backend hijacking
Source: CVE Program / CVE List V5
Vulnerability Description
Traefik is an open source HTTP reverse proxy and load balancer. From 3.0.0 until 3.6.25 and 3.7.10, Traefik's Kubernetes Gateway API provider in pkg/provider/kubernetes/gateway/httproute.go, grpcroute.go, tcproute.go, and tlsroute.go builds HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute router and service identities by hyphen-concatenating namespace, route name, Gateway identity, entry point, and rule index, allowing colliding Routes to overwrite another namespace's backend. This issue is fixed in 3.6.25 and 3.7.10.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用多个具有重复标识的资源
Source: CVE Program / CVE List V5
Vulnerability Title
Traefik 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Traefik是Traefik公司开源的一款负载均衡器。 Traefik 3.0.0版本至3.6.25之前版本和3.7.0版本至3.7.10之前版本存在处理逻辑错误漏洞，该漏洞源于pkg/provider/kubernetes/gateway/目录下的httproute.go、grpcroute.go、tcproute.go和tlsroute.go文件中，Kubernetes Gateway API provider在构建HTTPRoute、GRPCRoute、TCPRoute和TLSRoute路由及服务
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 >= 3.0.0, < 3.6.25 -

II. Public POCs for CVE-2026-71327

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8333 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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III. Intelligence Information for CVE-2026-71327

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Patches & Fixes for CVE-2026-71327 (1)

Vendor Advisories for CVE-2026-71327 (1)

Vendor Pages for CVE-2026-71327 (2)

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

CVE-2026-71324 7.0 HIGH Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend kee
CVE-2026-71325 4.8 MEDIUM Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef
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-694

V. Comments for CVE-2026-71327

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