Bug 2533375 (CVE-2026-53714)

Summary: CVE-2026-53714 github.com/envoyproxy/gateway: Envoy Gateway: Information Disclosure via Unauthenticated xDS gRPC Server
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Envoy Gateway. When operating in GatewayNamespaceMode, the xDS gRPC server fails to properly authenticate certain unary Fetch RPCs and State-of-the-World protocol messages. This oversight allows any pod with network access to port 18000 to retrieve sensitive information. An attacker can exploit this to disclose TLS private keys, xDS resources, backend endpoints, and routing configurations.
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Description OSIDB Bzimport 2026-09-14 20:31:31 UTC 
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, the xDS gRPC server in GatewayNamespaceMode, configured through provider.kubernetes.deploy.type=GatewayNamespace, installs a JWT StreamInterceptor but no UnaryInterceptor, leaving every unary Fetch RPC unauthenticated. The streaming interceptor also authenticates only discoveryv3.DeltaDiscoveryRequest messages; a discoveryv3.DiscoveryRequest used by the State-of-the-World protocol fails the type assertion and returns success without JWT validation. Any pod that can reach port 18000 can use the unauthenticated unary or State-of-the-World paths to retrieve TLS private keys through StreamSecrets, all xDS resources through StreamAggregatedResources, backend endpoints through StreamClusters or StreamEndpoints, and routing configuration through StreamRoutes or StreamListeners. This issue is fixed in versions 1.7.4 and 1.8.1.