| 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, 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 |
| sid, trixie | 8.18.0+~cs13.7.11-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| 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