Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message_CVE-2026-47207

{
    "lastseen": "",
    "description": "Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.34.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, Envoy crashes if an ext_proc server sends a single gRPC message containing multiple, specially crafted ProcessingResponse messages. This can occur when the first response in the batch causes the gRPC stream object to be destroyed, leading to a use-after-free error when Envoy attempts to process subsequent responses in the same gRPC message. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.",
    "published": "2026-06-26T17:52:27.739Z",
    "modified": "2026-06-26T18:30:08.843Z",
    "type": "cve",
    "title": "Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message",
    "source": "GitHub_M",
    "references": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-68cv-hq5f-g6xv",
    "id": "CVE-2026-47207",
    "bulletinFamily": "",
    "cwe": [
        "CWE-416"
    ],
    "cvelist": null,
    "sourceData": "envoyproxy envoy >= 1.38.0, < 1.38.3\nenvoyproxy envoy >= 1.37.0, < 1.37.5\nenvoyproxy envoy >= 1.36.0, < 1.36.9\nenvoyproxy envoy >= 1.34.0, < 1.35.13",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
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    "href": "",
    "category_name": "CVE",
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    "product": "envoy",
    "version": ">= 1.38.0, < 1.38.3",
    "vendor": "envoyproxy",
    "ai_description": "",
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    "ai_score": 0
}