CVE-2026-53717

Vulnerability 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.

CVSS Score

Related Weaknesses (CWE)

References

• https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c5095289203
• https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb015
• https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf2
• 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/releases/tag/v1.7.4
• https://github.com/envoyproxy/gateway/releases/tag/v1.8.1
• https://github.com/envoyproxy/gateway/security/advisories/GHSA-h7pq-86h8-rp5x