CVE-2026-31808
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
file-typenpm | >= 13.0.0, < 21.3.1 | 21.3.1 |
Affected products
4- osv-coords2 versions
< 3.2.0-r2+ 1 more
- (no CPE)range: < 3.2.0-r2
- (no CPE)range: >= 13.0.0, < 21.3.1
cpe:2.3:a:sindresorhus:file-type:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:sindresorhus:file-type:*:*:*:*:*:node.js:*:*range: >=13.0.0,<21.3.1
- (no CPE)range: >= 13.0.0, < 21.3.1
Patches
Vulnerability mechanics
References
4- github.com/sindresorhus/file-type/commit/319abf871b50ba2fa221b4a7050059f1ae096f4fnvdPatchWEB
- github.com/sindresorhus/file-type/security/advisories/GHSA-5v7r-6r5c-r473nvdMitigationPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-5v7r-6r5c-r473ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31808ghsaADVISORY
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