Socket.io - Improper type validation in attachment parsing

{
  "id": "97019b78d107319e6de5d1dea5277a6db7ad7c656992b478a3a264db22eaee0c",
  "url": "https://osv.dev/vulnerability/CVE-2022-2421",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Socket.io - Improper type validation in attachment parsing",
    "summary": "Due to improper type validation in attachment parsing the Socket.io js library, it is possible to overwrite the _placeholder object which allows an attacker to place references to functions at arbitrary places in the resulting query object.",
    "evidence": "osv:CVE-2022-2421",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2022-2421",
      "aliases": [
        "CVE-2022-2421",
        "GHSA-qm95-pgcg-qqfq"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/socketio/socket.io-parser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cd11e38e1a3e2146617bc586f86512605607b212"
                },
                {
                  "introduced": "652402a8568c2138da3c27c96756b32efca6c4bf"
                },
                {
                  "fixed": "4b3c191bc411578099c8dd35499d8c7a75860192"
                },
                {
                  "introduced": "c04d7f5c47ed712eb0f56cfc1a859f1aaa828f1e"
                },
                {
                  "fixed": "f3329eb5a46b215a3fdf91b6008c56cf177a4124"
                },
                {
                  "introduced": "5ad3e5cc4b16326e3def2b834bd90c0424bfdd83"
                },
                {
                  "fixed": "5a2ccff9d1d8fdbadd3faad9290a9e3b165cf9a2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.3.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "3.4.0"
                      },
                      {
                        "fixed": "3.4.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "4.0.0"
                      },
                      {
                        "fixed": "4.0.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:socket:socket.io-parser:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "4.1.0"
                      },
                      {
                        "fixed": "4.2.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.3.2",
            "4.0.4",
            "4.2.0",
            "4.1.2",
            "4.1.1",
            "4.1.0",
            "4.0.3",
            "3.3.1",
            "4.0.2",
            "4.0.1",
            "4.0.1-rc3",
            "4.0.1-rc2",
            "4.0.1-rc1",
            "4.0.0",
            "3.3.0",
            "3.4.1",
            "3.4.0",
            "3.2.0",
            "3.1.3",
            "3.1.2",
            "3.1.1",
            "3.1.0",
            "3.0.0",
            "2.3.2",
            "2.3.1",
            "2.3.0",
            "2.2.6",
            "2.2.5",
            "2.2.4",
            "2.2.3",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.5",
            "2.1.4",
            "2.1.3",
            "2.1.2",
            "2.1.1",
            "2.1.0",
            "2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-2421.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.132261199Z",
      "provider": "osv",
      "references": [
        "https://csirt.divd.nl/CVE-2022-2421",
        "https://csirt.divd.nl/DIVD-2022-00045",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/2xxx/CVE-2022-2421.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-2421"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-89"
        ],
        "cna_assigner": "DIVD",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "4.x"
                  },
                  {
                    "fixed": "4.2.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/2xxx/CVE-2022-2421.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-2421",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505456,
  "published_at": "2022-10-25T00:00:00+00:00"
}