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

Beschreibung

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.

Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.

Betroffene Produkte und Versionen

Referenzen und Patches

• https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56
• 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