CVE-2026-112778: traefik traefik

CVSS 8.8 (high) · published 2026-10-19

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.

Affected products (NVD): traefik traefik

Fixed in (NVD): 2.11.46, 3.6.16

Weakness: CWE-862

Source: NVD CVE-2026-112778

References

• https://github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f
• https://www.vulncheck.com/advisories/traefik-before-2.11.46-3.6.17-and-3.7.1-cross-namespace-resource-reference-via-kubernetes-annotations

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