What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-09-16
• Weakness: CWE-694

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.

Affected products

• Traefik: from 3.0.0 before 3.6.25; from 3.7.0 before 3.7.10 — fixed in 3.6.25, 3.7.10

How to fix

Upgrade to a fixed version: Traefik 3.6.25, 3.7.10. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/commit/a764166656f0cd337f917ac76315c381cca844f9
• https://github.com/traefik/traefik/pull/13580
• https://github.com/traefik/traefik/releases/tag/v3.6.25
• https://github.com/traefik/traefik/releases/tag/v3.7.10
• https://github.com/traefik/traefik/security/advisories/GHSA-fgjj-px3w-67xx

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