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CVE-2026-31808— file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header

Quick assessment

Affected
sindresorhus file-type
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

file type是Sindre Sorhus个人开发者的一个文件类型检测工具。 file type 21.3.1之前版本存在安全漏洞，该漏洞源于ASF文件类型检测解析器在处理特制输入时可能进入无限循环，可能导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.43% · P36
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I. Basic Information for CVE-2026-31808

Vulnerability Information
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Vulnerability Title
file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
file type 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
file type是Sindre Sorhus个人开发者的一个文件类型检测工具。 file type 21.3.1之前版本存在安全漏洞，该漏洞源于ASF文件类型检测解析器在处理特制输入时可能进入无限循环，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sindresorhus file-type >= 13.0.0, < 21.3.1 -

II. Public POCs for CVE-2026-31808

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III. Intelligence Information for CVE-2026-31808

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Patches & Fixes for CVE-2026-31808 (1)

Vendor Advisories for CVE-2026-31808 (1)

IV. Related Vulnerabilities

Same product: file-type
Same vendor: sindresorhus
Same weakness: CWE-835

V. Comments for CVE-2026-31808

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