file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header

{
  "id": "571cb145fd8d43116b3274f956f79f7fd74cdb02d6a893af85177f06ed00d4d0",
  "url": "https://osv.dev/vulnerability/CVE-2026-31808",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header",
    "summary": "file-type detects the file type of a file, stream, or data. Prior to 21.3.1, a denial of service vulnerability exists in the ASF (WMV/WMA) file type detection parser. When parsing a crafted input where an ASF sub-header has a size field of zero, the parser enters an infinite loop. The payload value becomes negative (-24), causing tokenizer.ignore(payload) to move the read position backwards, so the same sub-header is read repeatedly forever. Any application that uses file-type to detect the type of untrusted/attacker-controlled input is affected. An attacker can stall the Node.js event loop with a 55-byte payload. Fixed in version 21.3.1.",
    "evidence": "osv:CVE-2026-31808",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-31808",
      "aliases": [
        "CVE-2026-31808",
        "GHSA-5v7r-6r5c-r473"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/sindresorhus/file-type",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9e910d8a95e883271b4ef77feaa225dcc21d9782"
                },
                {
                  "fixed": "ad5857e5384874e853cc9c4c29b867f1135a7c30"
                },
                {
                  "fixed": "319abf871b50ba2fa221b4a7050059f1ae096f4f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sindresorhus:file-type:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "fixed": "21.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "319abf871b50ba2fa221b4a7050059f1ae096f4f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v21.3.0",
            "v21.2.0",
            "v21.1.1",
            "v21.1.0",
            "v21.0.0",
            "v20.5.0",
            "v20.4.1",
            "v20.4.0",
            "v20.3.0",
            "v20.2.0",
            "v20.1.0",
            "v20.0.1",
            "v20.0.0",
            "v19.6.0",
            "v19.5.0",
            "v19.4.1",
            "v19.4.0",
            "v19.3.0",
            "v19.2.0",
            "v19.1.1",
            "v19.1.0",
            "v19.0.0",
            "v18.7.0",
            "v18.6.0",
            "v18.5.0",
            "v18.4.0",
            "v18.3.0",
            "v18.2.1",
            "v18.2.0",
            "v18.1.0",
            "v18.0.0",
            "v17.1.6",
            "v17.1.5",
            "v17.1.4",
            "v17.1.3",
            "v17.1.2",
            "v17.1.1",
            "v17.1.0",
            "v17.0.2",
            "v17.0.1",
            "v17.0.0",
            "v16.5.1",
            "v16.5.0",
            "v16.4.0",
            "v16.3.0",
            "v16.2.0",
            "v16.1.0",
            "v16.0.1",
            "v16.0.0",
            "v15.0.1",
            "v15.0.0",
            "v14.7.1",
            "v14.7.0",
            "v14.6.2",
            "v14.6.1",
            "v14.6.0",
            "v14.5.0",
            "v14.4.0",
            "v14.3.0",
            "v14.2.0",
            "v14.1.4",
            "v14.1.3",
            "v14.1.2",
            "v14.1.1",
            "v14.1.0",
            "v14.0.0",
            "v13.1.2",
            "v13.1.1",
            "v13.1.0",
            "v13.0.3",
            "v13.0.2",
            "v13.0.1",
            "v13.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31808.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.698453613Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31808.json",
        "https://github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31808",
        "https://github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4f"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-835"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31808.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31808",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517848,
  "published_at": "2026-03-10T21:01:55.466+00:00"
}