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ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (websockets/ws@00c425e). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options.
CVE-2021-32640 - Medium Severity Vulnerability
Vulnerable Libraries - ws-6.2.1.tgz, ws-5.2.2.tgz
ws-6.2.1.tgz
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
Library home page: https://registry.npmjs.org/ws/-/ws-6.2.1.tgz
Path to dependency file: atanas.info/package.json
Path to vulnerable library: atanas.info/node_modules/ws
Dependency Hierarchy:
ws-5.2.2.tgz
Simple to use, blazing fast and thoroughly tested websocket client and server for Node.js
Library home page: https://registry.npmjs.org/ws/-/ws-5.2.2.tgz
Path to dependency file: atanas.info/package.json
Path to vulnerable library: atanas.info/node_modules/ws
Dependency Hierarchy:
Found in HEAD commit: aa2d19d30e3004c0c53d54f40d97e45b53f88e20
Vulnerability Details
ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the
Sec-Websocket-Protocol
header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (websockets/ws@00c425e). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the--max-http-header-size=size
and/or themaxHeaderSize
options.Publish Date: 2021-05-25
URL: CVE-2021-32640
CVSS 3 Score Details (5.3)
Base Score Metrics:
Suggested Fix
Type: Upgrade version
Origin: GHSA-6fc8-4gx4-v693
Release Date: 2021-05-25
Fix Resolution: ws - 7.4.6
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