6.4

CVE-2026-53718

Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerenvoyproxy
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Produkt gateway
Version < 1.7.4
Status affected
Version >= 1.8.0-rc.0, < 1.8.1
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 6.4 1.6 4.7
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
CWE-862 Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

https://github.com/envoyproxy/gateway/pull/9171
https://github.com/envoyproxy/gateway/pull/9172
https://github.com/envoyproxy/gateway/pull/9173
https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464
https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7
https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead
https://github.com/envoyproxy/gateway/releases/tag/v1.7.4
https://github.com/envoyproxy/gateway/releases/tag/v1.8.1
https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7