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CVE-2026-112778

CVE-2026-112778 · Traefik before 2.11.46, 3.6.17, and 3.7.1 Cross-Namespace Resource Reference via Kubernetes Annotations

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

Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotations in the Kubernetes Ingress provider, allowing references to Middlewares, ServersTransports, and TLSOptions in other namespaces. Attackers able to create or update Ingress or Service resources in one namespace can set router.middlewares or service.serverstransport annotations to obtain another tenant's injected credentials or reuse its client certificates, bypassing namespace-based tenant isolation.

CVSS 6.4 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: web

Affected products and versions

  • traefik

    Versions
    • ≥ 0, < 2.11.46: Affected (semver)
    • 2.11.46: Not affected (semver)

    Update to 2.11.46

  • traefik

    Versions
    • ≥ 3.0.0, < 3.6.17: Affected (semver)
    • 3.6.17: Not affected (semver)

    Update to 3.6.17

  • traefik

    Versions
    • ≥ 3.7.0, < 3.7.1: Affected (semver)
    • 3.7.1: Not affected (semver)

    Update to 3.7.1

Original sources

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