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Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M

CVE-2026-53716Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit

Medium 6.5

In plain English

A medium-severity security flaw 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 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.7%top 46.1% 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, getFileFromGZ in internal/wasm/httpfetcher.go calls io.ReadAll on a gzip.Reader without limiting decompressed output when a tenant-controlled EnvoyExtensionPolicy.spec.wasm[].code.http.url points to a reachable compressed Wasm payload. The 256 MiB compressed-input cap does not constrain the expanded size, no operator Wasm URL allowlist exists, and the optional sha256 check occurs only after decompression, so a comparatively small gzip stream can force a multi-gigabyte allocation in the shared controller. The resulting out-of-memory termination restarts the controller, re-reconciles the persistent custom resource, and can create a persistent cross-tenant control-plane outage. 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-cxpq-8v7q-cg56
Gogithub.com/envoyproxy/gateway1.7.4GHSA-cxpq-8v7q-cg56
Gogithub.com/envoyproxy/gateway1.7.4, 1.8.1GO-2026-6006

Affected products (as reported)

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

Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References