What’s Vulnerable › Vulnerabilities

CVE-2026-31988: yauzl 3.2.0 - Denial of Service via Off-by-One Error in NTFS Timestamp Parser

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-11 · updated 2026-06-17
• Weakness: CWE-193

Description

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

How to fix

Upgrade to a fixed version: thejoshwolfe yauzl 3.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/thejoshwolfe/yauzl/commit/c4695215b05c6adffda613b9051a2a85429b33fe
• https://www.codeant.ai/security-research/yauzl-denial-of-service-zip-file-crash
• https://www.npmjs.com/package/yauzl
• https://www.vulncheck.com/advisories/yauzl-denial-of-service-via-off-by-one-error-in-ntfs-timestamp-parser
• https://www.codeant.ai/security-research/yauzl-denial-of-service-zip-file-crash

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