Vulnerability-Lookup

GHSA-5V7R-6R5C-R473

Vulnerability from github – Published: 2026-03-10 23:57 – Updated: 2026-03-10 23:57

Summary

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

Details

Impact

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.

Patches

Fixed in version 21.3.1. Users should upgrade to >= 21.3.1.

Workarounds

Validate or limit the size of input buffers before passing them to file-type, or run file type detection in a worker thread with a timeout.

References

Fix commit: 319abf871b50ba2fa221b4a7050059f1ae096f4f

Reporter

crnkovic@lokvica.com

Severity ?

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "file-type"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "13.0.0"
            },
            {
              "fixed": "21.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-31808"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-835"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-10T23:57:09Z",
    "nvd_published_at": "2026-03-10T21:16:50Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nA 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.\n\nAny 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.\n\n### Patches\nFixed in version 21.3.1. Users should upgrade to \u003e= 21.3.1.\n\n### Workarounds\nValidate or limit the size of input buffers before passing them to `file-type`, or run file type detection in a worker thread with a timeout.\n\n### References\n- Fix commit: 319abf871b50ba2fa221b4a7050059f1ae096f4f\n\n### Reporter\n\ncrnkovic@lokvica.com",
  "id": "GHSA-5v7r-6r5c-r473",
  "modified": "2026-03-10T23:57:09Z",
  "published": "2026-03-10T23:57:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31808"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sindresorhus/file-type"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header"
}

CVE-2026-31808 (GCVE-0-2026-31808)

Vulnerability from cvelistv5 – Published: 2026-03-10 21:01 – Updated: 2026-03-11 16:00

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.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/sindresorhus/file-type/securit…	x_refsource_CONFIRM
	https://github.com/sindresorhus/file-type/commit/…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	sindresorhus	file-type	Affected: >= 13.0.0, < 21.3.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-31808",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-11T15:53:37.941340Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-11T16:00:14.754Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "file-type",
          "vendor": "sindresorhus",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 13.0.0, \u003c 21.3.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-10T21:01:55.466Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473"
        },
        {
          "name": "https://github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4f"
        }
      ],
      "source": {
        "advisory": "GHSA-5v7r-6r5c-r473",
        "discovery": "UNKNOWN"
      },
      "title": "file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-31808",
    "datePublished": "2026-03-10T21:01:55.466Z",
    "dateReserved": "2026-03-09T16:33:42.913Z",
    "dateUpdated": "2026-03-11T16:00:14.754Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5V7R-6R5C-R473

Impact

Patches

Workarounds

References

Reporter

CVE-2026-31808 (GCVE-0-2026-31808)

Tags

Sightings

Nomenclature