# CVE-2026-31988

## Summary

- **CVE ID:** CVE-2026-31988
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (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)
- **CWE:** CWE-193
- **Published:** Mar 11, 2026
- **Last Modified:** Mar 12, 2026

## 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 (3.2.0)
- thejoshwolfe — yauzl (3.2.1)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.48%
- **EPSS Percentile:** 40.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._