CVE-2026-45736: Ws Project Ws

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

ws is an open source WebSocket client and server for Node.js. Prior to 8.20.1, the websocket.close() implementation is vulnerable to uninitialized memory disclosure when a TypedArray is passed as the reason argument. This vulnerability is fixed in 8.20.1.

Affected products

• Ws Project Ws: from 8.0.0, before 8.20.1 (fixed in 8.20.1)

Published 2026-05-15. Last modified 2026-09-11.