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CVE-2026-54765 affects Traefik's Kubernetes Gateway API provider in versions 3.7.0 through 3.7.5. When two accepted HTTPRoutes target the same backend Service:port but define different backendRef filters, Traefik may resolve both routes to the same child service and incorrectly apply only one route's filter set to all requests reaching that backend. As a result, requests sent through one route can inherit the backendRef filter context of another route. Where those filters set security-sensitive headers such as tenant identity, authorization context, or other trusted backend metadata, this can cause backend context leakage and incorrect authorization decisions. The issue can also cross namespace boundaries if a ReferenceGrant allows cross-namespace backend targeting. The vulnerability is fixed in Traefik v3.7.6.
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