CVE-2026-112778

High

Description

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.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Traefik

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

traefik traefik2.11.46, 3.6.16 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-rh7m-2m44-x32f

Affected products

Product	Affected versions	Fixed in
traefik traefik	v < 2.11.46, 3.0.0 ≤ v < 3.6.16, 3.7.0	2.11.46, 3.6.16

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