Infinite loop in file-type - CVE-2026-31808
Published: April 28, 2026
Vulnerability identifier: #VU128266
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-31808
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Sindre Sorhus
Affected software:
file-type
file-type
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in the ASF file type detection parser when parsing a crafted ASF input with a zero-size sub-header. A remote attacker can supply a specially crafted 55-byte payload to cause a denial of service.
The issue can stall the Node.js event loop while processing untrusted or attacker-controlled input.
How to mitigate CVE-2026-31808
Install security update from vendor's website.