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chore(deps): update dependency socket.io to v4.8.0 (main)#15

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chore(deps): update dependency socket.io to v4.8.0 (main)#15
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This PR contains the following updates:

Package Change Age Adoption Passing Confidence
socket.io (source) 4.0.0 → 4.8.0 age adoption passing confidence

By merging this PR, the issue #8 will be automatically resolved and closed:

Severity CVSS Score Vulnerability Reachability
High High 7.5 CVE-2024-37890
High High 7.3 CVE-2023-32695
High High 7.3 CVE-2024-38355
High High 7.1 CVE-2022-41940
Medium Medium 5.3 CVE-2021-32640
Medium Medium 5.3 CVE-2024-47764

Release Notes

socketio/socket.io (socket.io)

v4.8.0

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Bug Fixes
  • allow to join a room in a middleware (uws) (b04fa64)
  • correctly await async close on adapters (#​4971) (e347a3c)
  • expose type of default engine (132d05f)
Dependencies

v4.7.5

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Bug Fixes
  • close the adapters when the server is closed (bf64870)
  • remove duplicate pipeline when serving bundle (e426f3e)
Links

v4.7.4

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Bug Fixes
  • typings: calling io.emit with no arguments incorrectly errored (cb6d2e0), closes #​4914
Links

v4.7.3

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Bug Fixes
  • return the first response when broadcasting to a single socket (#​4878) (df8e70f)
  • typings: allow to bind to a non-secure Http2Server (#​4853) (8c9ebc3)
Links

v4.7.2

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Bug Fixes
  • clean up child namespace when client is rejected in middleware (#​4773) (0731c0d)
  • webtransport: properly handle WebTransport-only connections (3468a19)
  • webtransport: add proper framing (a306db0)
Links

v4.7.1

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The client bundle contains a few fixes regarding the WebTransport support.

Links

v4.7.0

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Bug Fixes
  • remove the Partial modifier from the socket.data type (#​4740) (e5c62ca)
Features
Support for WebTransport

The Socket.IO server can now use WebTransport as the underlying transport.

WebTransport is a web API that uses the HTTP/3 protocol as a bidirectional transport. It's intended for two-way communications between a web client and an HTTP/3 server.

References:

Until WebTransport support lands in Node.js, you can use the @fails-components/webtransport package:

import { readFileSync } from "fs";
import { createServer } from "https";
import { Server } from "socket.io";
import { Http3Server } from "@​fails-components/webtransport";

// WARNING: the total length of the validity period MUST NOT exceed two weeks (https://w3c.github.io/webtransport/#custom-certificate-requirements)
const cert = readFileSync("/path/to/my/cert.pem");
const key = readFileSync("/path/to/my/key.pem");

const httpsServer = createServer({
  key,
  cert
});

httpsServer.listen(3000);

const io = new Server(httpsServer, {
  transports: ["polling", "websocket", "webtransport"] // WebTransport is not enabled by default
});

const h3Server = new Http3Server({
  port: 3000,
  host: "0.0.0.0",
  secret: "changeit",
  cert,
  privKey: key,
});

(async () => {
  const stream = await h3Server.sessionStream("/socket.io/");
  const sessionReader = stream.getReader();

  while (true) {
    const { done, value } = await sessionReader.read();
    if (done) {
      break;
    }
    io.engine.onWebTransportSession(value);
  }
})();

h3Server.startServer();

Added in 123b68c.

Client bundles with CORS headers

The bundles will now have the right Access-Control-Allow-xxx headers.

Added in 63f181c.

Links

v4.6.2

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Bug Fixes
Links

v4.6.1

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Bug Fixes
  • properly handle manually created dynamic namespaces (0d0a7a2)
  • types: fix nodenext module resolution compatibility (#​4625) (d0b22c6)
Links

v4.6.0

Compare Source

Bug Fixes
  • add timeout method to remote socket (#​4558) (0c0eb00)
  • typings: properly type emits with timeout (f3ada7d)
Features
Promise-based acknowledgements

This commit adds some syntactic sugar around acknowledgements:

  • emitWithAck()
try {
  const responses = await io.timeout(1000).emitWithAck("some-event");
  console.log(responses); // one response per client
} catch (e) {
  // some clients did not acknowledge the event in the given delay
}

io.on("connection", async (socket) => {
    // without timeout
  const response = await socket.emitWithAck("hello", "world");

  // with a specific timeout
  try {
    const response = await socket.timeout(1000).emitWithAck("hello", "world");
  } catch (err) {
    // the client did not acknowledge the event in the given delay
  }
});
  • serverSideEmitWithAck()
try {
  const responses = await io.timeout(1000).serverSideEmitWithAck("some-event");
  console.log(responses); // one response per server (except itself)
} catch (e) {
  // some servers did not acknowledge the event in the given delay
}

Added in 184f3cf.

Connection state recovery

This feature allows a client to reconnect after a temporary disconnection and restore its state:

  • id
  • rooms
  • data
  • missed packets

Usage:

import { Server } from "socket.io";

const io = new Server({
  connectionStateRecovery: {
    // default values
    maxDisconnectionDuration: 2 * 60 * 1000,
    skipMiddlewares: true,
  },
});

io.on("connection", (socket) => {
  console.log(socket.recovered); // whether the state was recovered or not
});

Here's how it works:

  • the server sends a session ID during the handshake (which is different from the current id attribute, which is public and can be freely shared)
  • the server also includes an offset in each packet (added at the end of the data array, for backward compatibility)
  • upon temporary disconnection, the server stores the client state for a given delay (implemented at the adapter level)
  • upon reconnection, the client sends both the session ID and the last offset it has processed, and the server tries to restore the state

The in-memory adapter already supports this feature, and we will soon update the Postgres and MongoDB adapters. We will also create a new adapter based on Redis Streams, which will support this feature.

Added in 54d5ee0.

Compatibility (for real) with Express middlewares

This feature implements middlewares at the Engine.IO level, because Socket.IO middlewares are meant for namespace authorization and are not executed during a classic HTTP request/response cycle.

Syntax:

io.engine.use((req, res, next) => {
  // do something

  next();
});

// with express-session
import session from "express-session";

io.engine.use(session({
  secret: "keyboard cat",
  resave: false,
  saveUninitialized: true,
  cookie: { secure: true }
}));

// with helmet
import helmet from "helmet";

io.engine.use(helmet());

A workaround was possible by using the allowRequest option and the "headers" event, but this feels way cleaner and works with upgrade requests too.

Added in 24786e7.

Error details in the disconnecting and disconnect events

The disconnect event will now contain additional details about the disconnection reason.

io.on("connection", (socket) => {
  socket.on("disconnect", (reason, description) => {
    console.log(description);
  });
});

Added in 8aa9499.

Automatic removal of empty child namespaces

This commit adds a new option, "cleanupEmptyChildNamespaces". With this option enabled (disabled by default), when a socket disconnects from a dynamic namespace and if there are no other sockets connected to it then the namespace will be cleaned up and its adapter will be closed.

import { createServer } from "node:http";
import { Server } from "socket.io";

const httpServer = createServer();
const io = new Server(httpServer, {
  cleanupEmptyChildNamespaces: true
});

Added in 5d9220b.

A new "addTrailingSlash" option

The trailing slash which was added by default can now be disabled:

import { createServer } from "node:http";
import { Server } from "socket.io";

const httpServer = createServer();
const io = new Server(httpServer, {
  addTrailingSlash: false
});

In the example above, the clients can omit the trailing slash and use /socket.io instead of /socket.io/.

Added in d0fd474.

Performance Improvements
  • precompute the WebSocket frames when broadcasting (da2b542)
Links:

v4.5.4

Compare Source

This release contains a bump of:

Links:

v4.5.3

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Bug Fixes
  • typings: accept an HTTP2 server in the constructor (d3d0a2d)
  • typings: apply types to "io.timeout(...).emit()" calls (e357daf)
Links:

v4.5.2

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Bug Fixes
  • prevent the socket from joining a room after disconnection (18f3fda)
  • uws: prevent the server from crashing after upgrade (ba497ee)
Links:

v4.5.1

Compare Source

Bug Fixes
  • forward the local flag to the adapter when using fetchSockets() (30430f0)
  • typings: add HTTPS server to accepted types (#​4351) (9b43c91)
Links:

v4.5.0

Compare Source

Bug Fixes
Features
  • add support for catch-all listeners for outgoing packets (531104d)

This is similar to onAny(), but for outgoing packets.

Syntax:

socket.onAnyOutgoing((event, ...args) => {
  console.log(event);
});
  • broadcast and expect multiple acks (8b20457)

Syntax:

io.timeout(1000).emit("some-event", (err, responses) => {
  // ...
});
  • add the "maxPayload" field in the handshake details (088dcb4)

So that clients in HTTP long-polling can decide how many packets they have to send to stay under the maxHttpBufferSize
value.

This is a backward compatible change which should not mandate a new major revision of the protocol (we stay in v4), as
we only add a field in the JSON-encoded handshake data:

0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000,"maxPayload":1000000}
Links:

v4.4.1

Compare Source

Bug Fixes
Links:

v4.4.0

Compare Source

Bug Fixes
  • only set 'connected' to true after middleware execution (02b0f73)
Features
  • add an implementation based on uWebSockets.js (c0d8c5a)
const { App } = require("uWebSockets.js");
const { Server } = require("socket.io");

const app = new App();
const io = new Server();

io.attachApp(app);

io.on("connection", (socket) => {
  // ...
});

app.listen(3000, (token) => {
  if (!token) {
    console.warn("port already in use");
  }
});
socket.timeout(5000).emit("my-event", (err) => {
  if (err) {
    // the client did not acknowledge the event in the given delay
  }
});
interface SocketData {
  name: string;
  age: number;
}

const io = new Server<ClientToServerEvents, ServerToClientEvents, InterServerEvents, SocketData>();

io.on("connection", (socket) => {
  socket.data.name = "john";
  socket.data.age = 42;
});
Links:

v4.3.2

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Bug Fixes
Links:

v4.3.1

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Bug Fixes
Links:

v4.3.0

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For this release, most of the work was done on the client side, see here.

Bug Fixes
  • typings: add name field to cookie option (#​4099) (033c5d3)
  • send volatile packets with binary attachments (dc81fcf)
Features
Links:

v4.2.0

Compare Source

Bug Fixes
  • typings: allow async listener in typed events (ccfd8ca)
Features
  • ignore the query string when serving client JavaScript (#​4024) (24fee27)
Links:

v4.1.3

Compare Source

Bug Fixes
  • fix io.except() method (94e27cd)
  • remove x-sourcemap header (a4dffc6)
Links:

v4.1.2

Compare Source

Bug Fixes
  • typings: ensure compatibility with TypeScript 3.x (0cb6ac9)
  • ensure compatibility with previous versions of the adapter (a2cf248)
Links:

v4.1.1

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Bug Fixes
  • typings: properly type server-side events (b84ed1e)
  • typings: properly type the adapter attribute (891b187)
Links:

v4.1.0

Compare Source

Blog post: https://socket.io/blog/socket-io-4-1-0/

Features
  • add support for inter-server communication (93cce05)
  • notify upon namespace creation (499c892)
  • add a "connection_error" event (7096e98, from engine.io)
  • add the "initial_headers" and "headers" events (2527543, from engine.io)
Links:

v4.0.2

Compare Source

Bug Fixes
  • typings: make "engine" attribute public (b81ce4c)
  • properly export the Socket class (d65b6ee)
Links:

v4.0.1

Compare Source

Bug Fixes
Links:
  • If you want to rebase/retry this PR, check this box

@mend-for-github-com mend-for-github-com Bot added the security fix Security fix generated by Mend label Apr 27, 2026
@mend-for-github-com mend-for-github-com Bot force-pushed the whitesource-remediate/main-socket.io-4.x-lockfile branch from b2d0305 to acbd3bd Compare April 28, 2026 03:32
@mend-for-github-com mend-for-github-com Bot force-pushed the whitesource-remediate/main-socket.io-4.x-lockfile branch from acbd3bd to 5bd5512 Compare May 17, 2026 13:09
@mend-for-github-com mend-for-github-com Bot changed the title chore(deps): update dependency socket.io to v4.8.3 (main) chore(deps): update dependency socket.io to v4.8.0 (main) May 17, 2026
@mend-for-github-com mend-for-github-com Bot force-pushed the whitesource-remediate/main-socket.io-4.x-lockfile branch from 5bd5512 to 438fe5d Compare May 21, 2026 03:30
@mend-for-github-com mend-for-github-com Bot force-pushed the whitesource-remediate/main-socket.io-4.x-lockfile branch from 438fe5d to 5e5b77f Compare June 20, 2026 03:38
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