CVE-2024-37890: Websockets Ws

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

ws is an open source WebSocket client and server for Node.js. A request with a number of headers exceeding theserver.maxHeadersCount threshold could be used to crash a ws server. The vulnerability was fixed in ws@8.17.1 (e55e510) and backported to ws@7.5.10 (22c2876), ws@6.2.3 (eeb76d3), and ws@5.2.4 (4abd8f6). In vulnerable versions of ws, the issue can be mitigated in the following ways: 1. Reduce the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options so that no more headers than the server.maxHeadersCount limit can be sent. 2. Set server.maxHeadersCount to 0 so that no limit is applied.

Affected products

• Websockets Ws: from 2.1.0, before 5.2.4 (fixed in 5.2.4); from 6.0.0, before 6.2.3 (fixed in 6.2.3); from 7.0.0, before 7.5.10 (fixed in 7.5.10); from 8.0.0, before 8.17.1 (fixed in 8.17.1); version 2.1.0 only; before 5.2.4 (fixed in 5.2.4); …

Published 2024-06-17. Last modified 2026-06-17.