CVE-2021-32640

Name	CVE-2021-32640
Description	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 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). 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`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-ws (PTS)	bullseye	7.4.2+~cs18.0.8-2	fixed
	bookworm	8.11.0+~cs13.7.3-1	fixed
	forky, sid, trixie	8.18.1+~cs14.18.2-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency
node-ws	source	stretch	(unfixed)	end-of-life
node-ws	source	buster	1.1.0+ds1.e6ddaae4-5+deb10u1
node-ws	source	(unstable)	7.4.2+~cs18.0.8-2

Notes

[stretch] - node-ws <end-of-life> (Nodejs in stretch not covered by security support)
https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff