🛡️ CVE-2026-31988 — yauzl

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-193 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

yauzl contains an off-by-one error

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Affected software

CVE-2026-31988 is recorded against 2 packages.

  • unknown
  • yauzl

Timeline and source

Published on 11 March 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
www.codeant.ai
www.npmjs.com
www.vulncheck.com
www.codeant.ai

CVE-2026-31988 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-193
Public Exploit ✅ No
Source NVD
Published 2026-03-11
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —
yauzl — —

Similar Threats

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