EnvoyProxy Envoy Gateway up to 1.7.3/1.8.0 Wasm HTTP Fetcher httpfetcher.go getFileFromGZ resource consumption

Summaryinfo

A vulnerability categorized as critical has been discovered in EnvoyProxy Envoy Gateway up to 1.7.3/1.8.0. The impacted element is the function getFileFromGZ of the file internal/wasm/httpfetcher.go of the component Wasm HTTP Fetcher. The manipulation results in resource consumption. This vulnerability is known as CVE-2026-53716. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in EnvoyProxy Envoy Gateway up to 1.7.3/1.8.0. Affected is the function getFileFromGZ of the file internal/wasm/httpfetcher.go of the component Wasm HTTP Fetcher. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-53716 since 06/10/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 1.7.4 or 1.8.1 eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Vendor

• EnvoyProxy

Name

• Envoy Gateway

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.8.0

License

• free

CPE 2.3info

• 🔒
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• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

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