CVE-2026-41174

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

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Produits concernés

• traefik
• Traefik traefik

Scores CVSS

Faiblesses (CWE)

• CWE-653
• CWE-863

Références

• https://github.com/traefik/traefik/commit/df00d82fc7f12e07199551832b54de6d0e55414d Patch
• https://github.com/traefik/traefik/releases/tag/v2.11.43 ProductRelease Notes
• https://github.com/traefik/traefik/releases/tag/v3.6.14 ProductRelease Notes
• https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2 ProductRelease Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-xhjw-95fp-8vgq ExploitPatchVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories