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CVE-2026-71325

CVE-2026-71325 · Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.8 · Medium · EPSS 0.2%

Published
Updated

Stack: web

Affected products and versions

  • traefik

    Versions
    • < 2.11.54: Affected
    • >= 3.0.0, < 3.6.25: Affected
    • >= 3.7.0, < 3.7.10: Affected

    No fix published

Original sources

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