CVE-2026-31988 yauzl 3.2.0 - Denial of Service via Off-by-One Error in NTFS Timestamp Parser
A remote attacker can crash Node.js applications processing zip files by sending a crafted archive with a malformed NTFS timestamp field.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-31988?
CVE-2026-31988 is a medium-severity denial of service vulnerability in thejoshwolfe yauzl, published on 11 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-193
Which versions are affected by CVE-2026-31988?
2 open source packages ship an affected version, including yauzl.
| Package | Affected | Fixed in |
|---|---|---|
yauzl npm | From 3.2.0 | 3.2.1 |
yauzl npm | From 3.2.0 | 3.2.1 |
How do I fix CVE-2026-31988?
Upgrade yauzl to 3.2.1 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-31988 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31988 exists.
Sources
Also known as ECHO-8347-6a0d-51d6, GHSA-gmq8-994r-jv83, MINI-22cx-g8jr-7fg7, MINI-2m86-62mx-874f, MINI-5ff9-68hf-p3v7, MINI-696q-7r8m-2793 and 11 more.