CVE-2026-31988: Thejoshwolfe Yauzl

Medium severity, CVSS 5.3. EPSS: 0.7% chance of exploitation in the next 30 days.

yauzl (aka Yet Another Unzip Library) version 3.2.0 for Node.js contains an off-by-one error in the NTFS extended timestamp extra field parser within the getLastModDate() function. The while loop condition checks cursor < data.length + 4 instead of cursor + 4 <= data.length, allowing readUInt16LE() to read past the buffer boundary. A remote attacker can cause a denial of service (process crash via ERR_OUT_OF_RANGE exception) by sending a crafted zip file with a malformed NTFS extra field. This affects any Node.js application that processes zip file uploads and calls entry.getLastModDate() on parsed entries. Fixed in version 3.2.1.

Affected products

• Thejoshwolfe Yauzl: from 3.2.0, before 3.2.1 (fixed in 3.2.1)

Published 2026-03-11. Last modified 2026-06-17.