file-type detects the file type of a file, stream, or data. Prior to 21.3.1, a denial of service…
Historical advisory recorded 25 Oct 2026 07:19:14 UTC. Read the latest advisory.
nvd · CVE-2026-31808
Publishedfile-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.
Read the publisher's advisoryAffected versions, risk and source history
nvd · CVE-2026-31808
PublishedNVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Analyzed
Weakness classifications: CWE-835
Original publisher date fields
published: 2026-03-10T21:16:50.173
lastModified: 2026-06-17T10:34:30.063
1 source CPE criteria · context only
- cpe:2.3:a:sindresorhus:file-type:*:*:*:*:*:node.js:*:*
The original JSON retains the logical configuration operators, exclusions and version bounds.
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON