CVE-2026-53715

Vulnerability 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, HTTPServer.ServeHTTP in internal/wasm/httpserver.go reads the plain mappingPath2Cache map without synchronization while HTTPServer.Get writes the same map during EnvoyExtensionPolicy translation. An attacker with pod-network access to unauthenticated port 18002 and tenant permission to churn policies with distinct Wasm URLs can flood GET requests until a per-request reader overlaps a writer. Go's concurrent map read and write detection invokes runtime.throw, which the net/http connection recovery cannot catch, terminating the controller process and causing a timing-dependent, cross-tenant control-plane denial of service until Kubernetes restarts the pod. This issue is fixed in versions 1.7.4 and 1.8.1.

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c5095289203
• https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb015
• https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf2
• 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/releases/tag/v1.7.4
• https://github.com/envoyproxy/gateway/releases/tag/v1.8.1
• https://github.com/envoyproxy/gateway/security/advisories/GHSA-8fv2-88gg-hm7q