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6.4 Medium

CVE-2026-53718 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway

Description

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 products and versions

Product Affected versions Fixed in
gateway 1.8 1.8.0-rc.0 → < 1.8.1 1.8.1
gateway 1.7 earliest → < 1.7.4 1.7.4

References

Timeline

  1. Published
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Other CVEs of gateway

The 10 CVEs of gateway →
CVE-2026-53714 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway 7.4 High CVE-2026-53716 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway 6.5 Medium CVE-2026-53715 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway 5.3 Medium CVE-2026-53719 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway 6.5 Medium
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