CVE-2026-71327

Received Received - Intake

Traefik Kubernetes Gateway API Route Collision Vulnerability

Publication date: 2026-08-06

Last updated on: 2026-08-06

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-06

Last Modified

2026-08-06

Generated

2026-08-07

AI Q&A

2026-08-07

EPSS Evaluated

N/A

NVD

CVE-2026-71327

Affected Vendors & Products

Vendor	Product	Version / Range
traefik	traefik	From 3.0.0 (inc) to 3.6.25 (inc)
traefik	traefik	3.7.10

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-694	The product uses multiple resources that can have the same identifier, in a context in which unique identifiers are required.

Attack-Flow Graph

Executive Summary

Traefik versions 3.0.0 to 3.6.25 and 3.7.10 have a vulnerability where the Kubernetes Gateway API provider incorrectly builds router and service identities for HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute by concatenating namespace, route name, Gateway identity, entry point, and rule index with hyphens. This allows malicious actors to create colliding routes that can overwrite backends in other namespaces.

Impact Analysis

This vulnerability could allow an attacker to redirect traffic intended for one service to a malicious backend, potentially leading to data breaches, service disruption, or unauthorized access. It affects multi-tenant Kubernetes clusters using Traefik's Gateway API provider.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR (data protection), HIPAA (health information security), and other regulations mandating strict access controls and data integrity.

Mitigation Strategies

Upgrade Traefik to version 3.6.25 or later for the 3.6.x branch, or to version 3.7.10 or later for the 3.7.x branch to address the issue.

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