# CVE-2026-53717

## Summary

- **CVE ID:** CVE-2026-53717
- **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 15, 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, internal/wasm/imagefetcher.go follows tenant-controlled EnvoyExtensionPolicy spec.wasm[].code.image.url values to Docker or OCI Wasm layers, and extractWasmPluginBinary uses the untrusted tar-header h.Size value to allocate memory before validating the entry name or declared size. A small PAX or GNU tar header can therefore claim a multi-terabyte entry even though the surrounding LimitReader restricts only the bytes read from the stream, and no registry allowlist prevents a permitted tenant from selecting an attacker-controlled registry that the controller can reach. The allocation is attempted for every tar entry and can cause an unrecoverable Go runtime out-of-memory failure; because the custom resource persists, reconciliation repeatedly crash-loops the shared controller and causes a single-request, non-volumetric, cluster-wide control-plane denial of service. 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-h7pq-86h8-rp5x)
- [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:** 0.71%
- **EPSS Percentile:** 52.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._