CVE-2026-45736 PUBLISHED

ws: Uninitialized memory disclosure

Assigner: GitHub_M
Reserved: 13.05.2026 Published: 15.05.2026 Updated: 15.05.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 4.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	High	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	websockets
Product	ws
Versions	Version >= 8.0.0, < 8.20.1 is affected

References

https://github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx
https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086

Problem Types

CWE-908: Use of Uninitialized Resource CWE