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CVE-2026-53716 (GCVE-0-2026-53716)

Vulnerability from cvelistv5 – Published: 2026-09-14 20:15 – Updated: 2026-09-14 20:15
VLAI
Title
Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit
Summary
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
Impacted products
Vendor Product Version CPE status
envoyproxy gateway Affected: < 1.7.4
Affected: >= 1.8.0-rc.0, < 1.8.1
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{
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        {
          "product": "gateway",
          "vendor": "envoyproxy",
          "versions": [
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              "status": "affected",
              "version": "\u003c 1.7.4"
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      ],
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        }
      ],
      "metrics": [
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
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      "providerMetadata": {
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        },
        {
          "name": "https://github.com/envoyproxy/gateway/releases/tag/v1.7.4",
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        }
      ],
      "source": {
        "advisory": "GHSA-cxpq-8v7q-cg56",
        "discovery": "UNKNOWN"
      },
      "title": "Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53716",
    "datePublished": "2026-09-14T20:15:51.441Z",
    "dateReserved": "2026-06-10T16:43:31.241Z",
    "dateUpdated": "2026-09-14T20:15:51.441Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-06-14",
      "epss": "0.00044",
      "percentile": "0.1411"
    },
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  }
}



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