{"id":"CVE-2026-53716","state":"PUBLISHED","title":"Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit","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.","publishedAt":"2026-09-14T20:15:51.441Z","updatedAt":"2026-09-16T16:21:20.674Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["envoyproxy gateway"],"affected":[{"vendor":"envoyproxy","product":"gateway","versions":[{"version":"< 1.7.4","status":"affected"},{"version":">= 1.8.0-rc.0, < 1.8.1","status":"affected"}]}],"references":["https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56","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/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","https://github.com/envoyproxy/gateway/releases/tag/v1.8.1"],"weaknesses":["CWE-789"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53716.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53716","state":"PUBLISHED","datePublished":"2026-09-14T20:15:51.441Z","dateUpdated":"2026-09-16T16:21:20.674Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-10T16:43:31.241Z"},"containers":{"cna":{"title":"Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit","descriptions":[{"lang":"en","value":"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":[{"vendor":"envoyproxy","product":"gateway","versions":[{"version":"< 1.7.4","status":"affected"},{"version":">= 1.8.0-rc.0, < 1.8.1","status":"affected"}]}],"references":[{"url":"https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56","name":"https://github.com/envoyproxy/gateway/security/advisories/GHSA-cxpq-8v7q-cg56","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/envoyproxy/gateway/pull/9171","name":"https://github.com/envoyproxy/gateway/pull/9171","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/pull/9172","name":"https://github.com/envoyproxy/gateway/pull/9172","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/pull/9173","name":"https://github.com/envoyproxy/gateway/pull/9173","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","name":"https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","name":"https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","name":"https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","name":"https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","tags":["x_refsource_MISC"]},{"url":"https://github.com/envoyproxy/gateway/releases/tag/v1.8.1","name":"https://github.com/envoyproxy/gateway/releases/tag/v1.8.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-14T20:15:51.441Z"},"source":{"advisory":"GHSA-cxpq-8v7q-cg56","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T16:21:03.789017Z","id":"CVE-2026-53716","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T16:21:20.674Z"}}]}}}