CVE-2026-31808

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.

• CWE-835

• https://github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4fPatch
• https://github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473Mitigation, Patch, Vendor Advisory

Published

Mar 10, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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