chore(deps): update dependency ws to v8.20.1 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ws	8.14.2 → 8.20.1

---

ws affected by a DoS when handling a request with many HTTP headers

CVE-2024-37890 / GHSA-3h5v-q93c-6h6q

More information

Details

Impact

A request with a number of headers exceeding the server.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 ws@8.17.1 (websockets/ws@e55e510) and backported to ws@7.5.10 (websockets/ws@22c2876), ws@6.2.3 (websockets/ws@eeb76d3), and ws@5.2.4 (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

• GHSA-3h5v-q93c-6h6q
• https://www.cve.org/CVERecord?id=CVE-2024-37890
• https://github.com/websockets/ws/issues/2230
• https://github.com/websockets/ws/pull/2231

Severity

• CVSS Score: 8.7 / 10 (High)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

• https://github.com/websockets/ws/security/advisories/GHSA-3h5v-q93c-6h6q
• https://github.com/websockets/ws/issues/2230
• https://github.com/websockets/ws/pull/2231
• https://github.com/websockets/ws/commit/22c28763234aa75a7e1b76f5c01c181260d7917f
• https://github.com/websockets/ws/commit/4abd8f6de4b0b65ef80b3ff081989479ed93377e
• https://github.com/websockets/ws/commit/e55e5106f10fcbaac37cfa89759e4cc0d073a52c
• https://github.com/websockets/ws/commit/eeb76d313e2a00dd5247ca3597bba7877d064a63
• https://github.com/advisories/GHSA-3h5v-q93c-6h6q

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

ws: Uninitialized memory disclosure

CVE-2026-45736 / GHSA-58qx-3vcg-4xpx

More information

Details

Impact

The websocket.close() implementation is vulnerable to uninitialized memory disclosure when a TypedArray is passed as the reason argument.

Proof of concept

import { deepStrictEqual } from 'node:assert';
import { WebSocket, WebSocketServer } from 'ws';

const wss = new WebSocketServer(
  { port: 0, skipUTF8Validation: true },
  function () {
    const { port } = wss.address();
    const ws = new WebSocket(`ws://localhost:${port}`, {
      skipUTF8Validation: true
    });

    ws.on('close', function (code, reason) {
      deepStrictEqual(reason, Buffer.alloc(80));
    });
  }
);

wss.on('connection', function (ws) {
  ws.close(1000, new Float32Array(20));
});

Patches

The vulnerability was fixed in ws@8.20.1 (websockets/ws@c0327ec).

Credits

Credit for the private and responsible disclosure of this issue goes to Nikita Skovoroda.

Remarks

Although the calculated CVSS severity is medium, the actual severity is believed to be low, as the flaw is only exploitable through misuse that is unlikely in practice.

Resources

• GHSA-58qx-3vcg-4xpx
• https://www.cve.org/CVERecord?id=CVE-2026-45736

Severity

• CVSS Score: 4.4 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

References

• https://github.com/websockets/ws/security/advisories/GHSA-58qx-3vcg-4xpx
• https://nvd.nist.gov/vuln/detail/CVE-2026-45736
• https://github.com/websockets/ws/commit/c0327ec15a54d701eb6ccefaa8bef328cfc03086
• https://github.com/advisories/GHSA-58qx-3vcg-4xpx

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Release Notes

websockets/ws (ws)

v8.20.1

Compare Source

Bug fixes

• Fixed an uninitialized memory disclosure issue in websocket.close()
  (c0327ec).

Providing a TypedArray (e.g. Float32Array) as the reason argument for
websocket.close(), rather than the supported string or Buffer types, caused
uninitialized memory to be disclosed to the remote peer.

import { deepStrictEqual } from 'node:assert';
import { WebSocket, WebSocketServer } from 'ws';

const wss = new WebSocketServer(
  { port: 0, skipUTF8Validation: true },
  function () {
    const { port } = wss.address();
    const ws = new WebSocket(`ws://localhost:${port}`, {
      skipUTF8Validation: true
    });

    ws.on('close', function (code, reason) {
      deepStrictEqual(reason, Buffer.alloc(80));
    });
  }
);

wss.on('connection', function (ws) {
  ws.close(1000, new Float32Array(20));
});

The issue was privately reported by Nikita Skovoroda.

v8.20.0

Compare Source

Features

• Added exports for the PerMessageDeflate class and utilities for the
  Sec-WebSocket-Extensions and Sec-WebSocket-Protocol headers (d3503c1).

v8.19.0

Compare Source

Features

• Added the closeTimeout option (#​2308).

Bug fixes

• Handled a forthcoming breaking change in Node.js core (1998485).

v8.18.3

Compare Source

Bug fixes

• Fixed a spec violation where the Sec-WebSocket-Version header was not added
  to the HTTP response if the client requested version was either invalid or
  unacceptable (#​2291).

v8.18.2

Compare Source

Bug fixes

• Fixed an issue that, during message decompression when the maximum size was
  exceeded, led to the emission of an inaccurate error and closure of the
  connection with an improper close code (#​2285).

v8.18.1

Compare Source

Bug fixes

• The length of the UNIX domain socket paths in the tests has been shortened to
  make them work when run via CITGM (021f7b8).

v8.18.0

Compare Source

Features

• Added support for Blob (#​2229).

v8.17.1

Compare Source

Bug fixes

• Fixed a DoS vulnerability (#​2231).

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

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();
});

The vulnerability was reported by Ryan LaPointe in #​2230.

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.

v8.17.0

Compare Source

Features

• The WebSocket constructor now accepts the createConnection option (#​2219).

Other notable changes

• The default value of the allowSynchronousEvents option has been changed to
  true (#​2221).

This is a breaking change in a patch release. The assumption is that the option
is not widely used.

v8.16.0

Compare Source

Features

• Added the autoPong option (01ba54e).

v8.15.1

Compare Source

Notable changes

• The allowMultipleEventsPerMicrotask option has been renamed to
  allowSynchronousEvents (4ed7fe5).

This is a breaking change in a patch release that could have been avoided with
an alias, but the renamed option was added only 3 days ago, so hopefully it
hasn't already been widely used.

v8.15.0

Compare Source

Features

• Added the allowMultipleEventsPerMicrotask option (93e3552).

---

Configuration

📅 Schedule: (UTC)

• Branch creation
  • At any time (no schedule defined)
• 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.

[coderabbitai]

Important

Review skipped

Bot user detected.

To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

---

Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media?

Share

• X
• Mastodon
• Reddit
• LinkedIn

Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>.
  • Generate unit testing code for this file.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
  • @coderabbitai generate unit testing code for this file.
  • @coderabbitai modularize this function.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai generate interesting stats about this repository and render them as a table.
  • @coderabbitai show all the console.log statements in this repository.
  • @coderabbitai read src/utils.ts and generate unit testing code.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.
  • @coderabbitai help me debug CodeRabbit configuration file.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

CodeRabbit Commands (invoked as PR comments)

• @coderabbitai pause to pause the reviews on a PR.
• @coderabbitai resume to resume the paused reviews.
• @coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
• @coderabbitai full review to do a full review from scratch and review all the files again.
• @coderabbitai summary to regenerate the summary of the PR.
• @coderabbitai resolve resolve all the CodeRabbit review comments.
• @coderabbitai configuration to show the current CodeRabbit configuration for the repository.
• @coderabbitai help to get help.

Additionally, you can add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.

CodeRabbit Configration File (.coderabbit.yaml)

• You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
• Please see the configuration documentation for more information.
• If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Documentation and Community

• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.