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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53716
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 21:17:12 UTC
Updated2026-09-30 17:43:24 UTC
DescriptionEnvoy 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.007150000 probability, percentile 0.534620000 (date 2026-10-26)

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Envoyproxy Gateway affected < 1.7.4 Not specified
CNA Envoyproxy Gateway affected >= 1.8.0-rc.0, < 1.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/envoyproxy/gateway/releases/tag/v1.8.1 [email protected] github.com
github.com/envoyproxy/gateway/pull/9173 [email protected] github.com
github.com/envoyproxy/gateway/pull/9172 [email protected] github.com
github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf2... [email protected] github.com
github.com/envoyproxy/gateway/releases/tag/v1.7.4 [email protected] github.com
github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56 [email protected] github.com
github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb015... [email protected] github.com
github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c5095289203... [email protected] github.com
github.com/envoyproxy/gateway/pull/9171 [email protected] github.com
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