CVE-2026-71327 Traefik: Gateway API route identity collision allows cross-namespace backend hijacking
Traefik's Gateway API provider allows cross-namespace backend hijacking via route identity collisions, enabling unauthorized access to other namespaces' backends.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71327?
CVE-2026-71327 is a high-severity missing authorization vulnerability in Traefik Traefik, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-694
Which versions are affected by CVE-2026-71327?
7 open source packages ship an affected version, including github.com/traefik/traefik/v3, github.com/traefik/traefik and github.com/traefik/traefik/v2. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik/v3 Go | From 3.0.0 | 3.6.25, 3.7.10 |
github.com/traefik/traefik/v3 Go | From 3.0.0 | 3.6.25 |
github.com/traefik/traefik/v3 Go | From 3.0.0 | 3.6.25 |
github.com/traefik/traefik/v3 Go | From 3.7.0 | 3.7.10 |
github.com/traefik/traefik/v3 Go | From 3.7.0 | 3.7.10 |
github.com/traefik/traefik Go | All versions | None |
1 more packages
github.com/traefik/traefik/v2 Go | All versions | None |
Products include Traefik Traefik.
How do I fix CVE-2026-71327?
Upgrade github.com/traefik/traefik/v3 to a fixed version for your release line: 3.6.25 or 3.7.10.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-71327 being exploited?
There is no known exploitation of CVE-2026-71327 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as GHSA-fgjj-px3w-67xx, GO-2026-6209, MINI-c96h-x6cc-gfjf, MINI-rpjj-q3cv-w7mq, MINI-w7cp-7r66-r5c7.