CVE-2026-53718

Summary

Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API ReferenceGrant in the target namespace. The custom-backend branch in internal/gatewayapi/route.go omits validateBackendNamespace, allowing the route-owning namespace to bind to and use the resource without the backend namespace owner's consent and violating the Gateway API cross-namespace authorization model. This issue is fixed in versions 1.7.4 and 1.8.1.

Affected Software

VendorProductVersion RangeStatus
envoyproxygateway< 1.7.4affected
envoyproxygateway>= 1.8.0-rc.0, < 1.8.1affected

Weaknesses

  • CWE-862: CWE-862: Missing Authorization

References