Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message

{
  "id": "201d2a1cf53b41747f465450c5c277e2850958f465ea16aab9560d97339f0f79",
  "url": "https://osv.dev/vulnerability/CVE-2026-47207",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Envoy crashes if multiple unexpected ext_proc responses are packed into one gRPC message",
    "summary": "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.",
    "evidence": "osv:CVE-2026-47207",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-47207",
      "aliases": [
        "BIT-envoy-2026-47207",
        "CVE-2026-47207",
        "GHSA-68cv-hq5f-g6xv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/envoyproxy/envoy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d7809ba2b07fd869d49bfb122b27f6a7977b4d94"
                },
                {
                  "fixed": "adb998f2875986005be294d10231a9c9a497e30d"
                },
                {
                  "introduced": "63ee0dc79dce88117c6bd2df5a742f8eb67ea980"
                },
                {
                  "fixed": "57198c441a298a75097c690726d90974549a9778"
                },
                {
                  "introduced": "6d9bb7d9a85d616b220d1f8fe67b61f82bbdb8d3"
                },
                {
                  "fixed": "f97695a50e11f5ff6719e129a466bf9204b64a7f"
                },
                {
                  "introduced": "f1dd21b16c244bda00edfb5ffce577e12d0d2ec2"
                },
                {
                  "fixed": "0ebfcfe5b0484b89ca85b761da9e05ce75dbda8d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.34.0"
                      },
                      {
                        "fixed": "1.35.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.36.0"
                      },
                      {
                        "fixed": "1.36.9"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.37.0"
                      },
                      {
                        "fixed": "1.37.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.38.0"
                      },
                      {
                        "fixed": "1.38.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.38.2",
            "v1.37.4",
            "v1.36.8",
            "v1.35.12",
            "v1.38.1",
            "v1.37.3",
            "v1.36.7",
            "v1.35.11",
            "v1.38.0",
            "v1.37.2",
            "v1.36.6",
            "v1.35.10",
            "v1.37.1",
            "v1.36.5",
            "v1.35.9",
            "v1.37.0",
            "v1.36.4",
            "v1.35.8",
            "v1.36.3",
            "v1.35.7",
            "v1.35.6",
            "v1.36.2",
            "v1.36.1",
            "v1.35.5",
            "v1.36.0",
            "v1.35.4",
            "v1.35.3",
            "v1.35.2",
            "v1.35.1",
            "v1.35.0",
            "v1.34.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47207.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.148761381Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47207.json",
        "https://github.com/envoyproxy/envoy/security/advisories/GHSA-68cv-hq5f-g6xv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-47207"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-416"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47207.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-47207",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490719,
  "published_at": "2026-06-26T17:52:27.739+00:00"
}