CVE-2026-53718
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.4
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
- EPSS probability
- 0.33%
- CWE
- CWE-862
- Published
- 2026-09-14
- Last modified
- 2026-09-15
Affected products
- envoyproxy gateway
- envoyproxy gateway
Weakness type
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