Traefik is an open-source edge router that makes publishing services a fun and easy experience

Overview

Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.

Affected

• traefik < 2.11.54
• traefik >= 3.0.0, < 3.6.25
• traefik >= 3.7.0, <= 3.7.10

Remediation

Upgrade past the affected range:

• traefik 3.6.25

Package advisory (CVE-2026-71325)

Affected packages:

• github.com/traefik/traefik/v2 <= 2.11.53
• github.com/traefik/traefik/v3 >= 3.0.0, <= 3.6.24
• github.com/traefik/traefik/v3 >= 3.7.0, <= 3.7.9
• github.com/traefik/traefik <= 1.7.34

Patched in:

• github.com/traefik/traefik/v2 2.11.54
• github.com/traefik/traefik/v3 3.6.25
• github.com/traefik/traefik/v3 3.7.10

Source: https://github.com/advisories/GHSA-62fc-8686-hfmq

Vendor advisories

• Red Hat VEX · Important · affected: Red Hat OpenShift Dev Spaces · no fix planned: Red Hat OpenShift Dev Spaces · updated 2026-09-16 · vex