# CVE-2026-53716

## Summary

- **CVE ID:** CVE-2026-53716
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-789
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 16, 2026

## 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 Products

- envoyproxy — gateway (< 1.7.4)
- envoyproxy — gateway (>= 1.8.0-rc.0, < 1.8.1)

## References

- [CNA](https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56)
- [CNA](https://github.com/envoyproxy/gateway/pull/9171)
- [CNA](https://github.com/envoyproxy/gateway/pull/9172)
- [CNA](https://github.com/envoyproxy/gateway/pull/9173)
- [CNA](https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464)
- [CNA](https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7)
- [CNA](https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead)
- [CNA](https://github.com/envoyproxy/gateway/releases/tag/v1.7.4)
- [CNA](https://github.com/envoyproxy/gateway/releases/tag/v1.8.1)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.69%
- **EPSS Percentile:** 51.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._