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Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M

CVE-2026-53715Envoy Gateway: Wasm cache ServeHTTP reads mappingPath2Cache without lock

Medium 5.3

In plain English

A medium-severity race condition in gateway from envoyproxy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 59.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/envoyproxy/gateway1.8.1GHSA-8fv2-88gg-hm7q
Gogithub.com/envoyproxy/gateway1.7.4GHSA-8fv2-88gg-hm7q
Gogithub.com/envoyproxy/gateway1.7.4, 1.8.1GO-2026-6005

Affected products (as reported)

VendorProductVersions
envoyproxy gateway < 1.7.4>= 1.8.0-rc.0, < 1.8.1

Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References