Update dependency socket.io to v4 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
socket.io (source)	^3.0.0 → ^4.6.2

---

socket.io has an unhandled 'error' event

CVE-2024-38355 / GHSA-25hc-qcg6-38wj

More information

Details

Impact

A specially crafted Socket.IO packet can trigger an uncaught exception on the Socket.IO server, thus killing the Node.js process.

node:events:502
    throw err; // Unhandled 'error' event
    ^

Error [ERR_UNHANDLED_ERROR]: Unhandled error. (undefined)
    at new NodeError (node:internal/errors:405:5)
    at Socket.emit (node:events:500:17)
    at /myapp/node_modules/socket.io/lib/socket.js:531:14
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11) {
  code: 'ERR_UNHANDLED_ERROR',
  context: undefined
}

Affected versions

Version range	Needs minor update?
4.6.2...latest	Nothing to do
3.0.0...4.6.1	Please upgrade to socket.io@4.6.2 (at least)
2.3.0...2.5.0	Please upgrade to socket.io@2.5.1

Patches

This issue is fixed by socketio/socket.io@15af22f, included in socket.io@4.6.2 (released in May 2023).

The fix was backported in the 2.x branch today: socketio/socket.io@d30630b

Workarounds

As a workaround for the affected versions of the socket.io package, you can attach a listener for the "error" event:

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

For more information

If you have any questions or comments about this advisory:

• Open a discussion here

Thanks a lot to Paul Taylor for the responsible disclosure.

References

• socketio/socket.io@15af22f
• socketio/socket.io@d30630b

Severity

• CVSS Score: 6.9 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References

• https://github.com/socketio/socket.io/security/advisories/GHSA-25hc-qcg6-38wj
• https://github.com/socketio/socket.io/commit/15af22fc22bc6030fcead322c106f07640336115
• https://github.com/socketio/socket.io/commit/d30630ba10562bf987f4d2b42440fc41a828119c
• https://nvd.nist.gov/vuln/detail/CVE-2024-38355
• https://github.com/advisories/GHSA-25hc-qcg6-38wj

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

---

Release Notes

socketio/socket.io (socket.io)

v4.6.2

Compare Source

Bug Fixes

• exports: move types condition to the top (#​4698) (3d44aae)

Links

• Diff: socketio/socket.io@4.6.1...4.6.2
• Client release: 4.6.2
• engine.io@~6.4.2 (diff)
• ws@~8.11.0 (no change)

v4.6.1

Compare Source

Bug Fixes

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

Links

• Diff: socketio/socket.io@4.6.0...4.6.1
• Client release: 4.6.1
• engine.io@~6.4.1 (diff)
• ws@~8.11.0 (no change)

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:

• Diff: socketio/socket.io@4.5.4...4.6.0
• Client release: 4.6.0
• engine.io@~6.4.0 (diff)
• ws@~8.11.0 (diff)

v4.5.4

Compare Source

This release contains a bump of:

• engine.io in order to fix CVE-2022-41940
• socket.io-parser in order to fix CVE-2022-2421.

Links:

• Diff: socketio/socket.io@4.5.3...4.5.4
• Client release: 4.5.4
• engine.io@~6.2.1 (diff)
• ws@~8.2.3

v4.5.3

Compare Source

Bug Fixes

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

Links:

• Diff: socketio/socket.io@4.5.2...4.5.3
• Client release: 4.5.3
• engine.io version: ~6.2.0
• ws version: ~8.2.3

v4.5.2

Compare Source

Bug Fixes

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

Links:

• Diff: socketio/socket.io@4.5.1...4.5.2
• Client release: 4.5.2
• engine.io version: ~6.2.0
• ws version: ~8.2.3

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:

• Diff: socketio/socket.io@4.5.0...4.5.1
• Client release: 4.5.1
• engine.io version: ~6.2.0
• ws version: ~8.2.3

v4.5.0

Compare Source

Bug Fixes

• typings: ensure compatibility with TypeScript 3.x (#​4259) (02c87a8)

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:

• Diff: socketio/socket.io@4.4.1...4.5.0
• Client release: 4.5.0
• engine.io version: ~6.2.0 (diff)
• ws version: ~8.2.3

v4.4.1

Compare Source

Bug Fixes

• types: make RemoteSocket.data type safe (#​4234) (770ee59)
• types: pass SocketData type to custom namespaces (#​4233) (f2b8de7)

Links:

• Diff: socketio/socket.io@4.4.0...4.4.1
• Client release: 4.4.1
• engine.io version: ~6.1.0 (diff)
• ws version: ~8.2.3

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");
  }
});

• add timeout feature (f0ed42f)

socket.timeout(5000).emit("my-event", (err) => {
  if (err) {
    // the client did not acknowledge the event in the given delay
  }
});

• add type information to socket.data (#​4159) (fe8730c)

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:

• Diff: socketio/socket.io@4.3.2...4.4.0
• Client release: 4.4.0
• engine.io version: ~6.1.0 (diff)
• ws version: ~8.2.3

v4.3.2

Compare Source

Bug Fixes

• fix race condition in dynamic namespaces (#​4137) (9d86397)

Links:

• Diff: socketio/socket.io@4.3.1...4.3.2
• Client release: 4.3.2
• engine.io version: ~6.0.0
• ws version: ~8.2.3

v4.3.1

Compare Source

Bug Fixes

• fix server attachment (#​4127) (0ef2a4d)

Links:

• Diff: socketio/socket.io@4.3.0...4.3.1
• Client release: 4.3.1
• engine.io version: ~6.0.0
• ws version: ~8.2.3

v4.3.0

Compare Source

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

• serve ESM bundle (60edecb)

Links:

• Diff: socketio/socket.io@4.2.0...4.3.0
• Client release: 4.3.0
• engine.io version: ~6.0.0 (diff)
• ws version: ~8.2.3 (diff)

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:

• Diff: socketio/socket.io@4.1.3...4.2.0
• Client release: 4.2.0
• engine.io version: ~5.2.0
• ws version: ~7.4.2

v4.1.3

Compare Source

Bug Fixes

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

Links:

• Diff: socketio/socket.io@4.1.2...4.1.3
• Client release: 4.1.3
• engine.io version: ~5.1.0
• ws version: ~7.4.2

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:

• Diff: socketio/socket.io@4.1.1...4.1.2
• Client release: 4.1.2
• engine.io version: ~5.1.0
• ws version: ~7.4.2

v4.1.1

Compare Source

Bug Fixes

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

Links:

• Diff: socketio/socket.io@4.1.0...4.1.1
• Client release: 4.1.1
• engine.io version: ~5.1.0
• ws version: ~7.4.2

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:

• Diff: socketio/socket.io@4.0.2...4.1.0
• Client release: 4.1.0
• engine.io version: ~5.1.0
• ws version: ~7.4.2

v4.0.2

Compare Source

Bug Fixes

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

Links:

• Diff: socketio/socket.io@4.0.1...4.0.2
• Client release: 4.0.2
• engine.io version: ~5.0.0
• ws version: ~7.4.2

v4.0.1

Compare Source

Bug Fixes

• typings: add fallback to untyped event listener (#​3834) (a11152f)
• typings: update return type from emit (#​3843) (1a72ae4)

Links:

• Diff: socketio/socket.io@4.0.0...4.0.1
• Client release: 4.0.1
• engine.io version: ~5.0.0
• ws version: ~7.4.2

v4.0.0

Compare Source

Blog post: https://socket.io/blog/socket-io-4-release/
Migration guide: https://socket.io/docs/v3/migrating-from-3-x-to-4-0/

Bug Fixes

• make io.to(...) immutable (ac9e8ca)

Features

• add some utility methods (b25495c)
• add support for typed events (#​3822) (0107510)
• allow to exclude specific rooms when broadcasting (#​3789) (7de2e87)
• allow to pass an array to io.to(...) (085d1de)

BREAKING CHANGES

• io.to(...) now returns an immutable operator

Previously, broadcasting to a given room (by calling io.to()) would mutate the io instance, which could lead to surprising behaviors, like:

io.to("room1");
io.to("room2").emit(/* ... */); // also sent to room1

// or with async/await
io.to("room3").emit("details", await fetchDetails()); // random behavior: maybe in room3, maybe to all clients

Calling io.to() (or any other broadcast modifier) will now return an immutable instance.

Links:

• Diff: socketio/socket.io@3.1.2...4.0.0
• Client release: 4.0.0
• engine.io version: ~5.0.0
• ws version: ~7.4.2

v3.1.2

Compare Source

Bug Fixes

• ignore packets received after disconnection (494c64e)

Links:

• Diff: socketio/socket.io@3.1.1...3.1.2
• Client release: 3.1.2
• engine.io version: ~4.1.0
• ws version: ~7.4.2

v3.1.1

Compare Source

Bug Fixes

• properly parse the CONNECT packet in v2 compatibility mode (6f4bd7f)
• typings: add return types and general-case overload signatures (#​3776) (9e8f288)
• typings: update the types of "query", "auth" and "headers" (4f2e9a7)

Links:

• Diff: socketio/socket.io@3.1.0...3.1.1
• Client release: 3.1.1
• engine.io version: ~4.1.0
• ws version: ~7.4.2

v3.1.0

Compare Source

In order to ease the migration to Socket.IO v3, the v3 server is now able to communicate with v2 clients:

const io = require("socket.io")({
  allowEIO3: true // false by default
});

Note: the allowEIO3 refers to the version 3 of the Engine.IO protocol which is used in Socket.IO v2

Features

• confirm a weak but matching ETag (#​3485) (161091d)
• esm: export the Namespace and Socket class (#​3699) (233650c)
• add support for Socket.IO v2 clients (9925746)
• add room events (155fa63)

Bug Fixes

• allow integers as event names (1c220dd)

Links:

• Diff: socketio/socket.io@3.0.5...3.1.0
• Client release: 3.1.0
• engine.io version: ~4.1.0
• ws version: ~7.4.2

v3.0.5

Compare Source

Bug Fixes

• properly clear timeout on connection failure (170b739)

Reverts

• restore the socket middleware functionality (bf54327)

Links:

• Diff: socketio/socket.io@3.0.4...3.0.5
• Client release: 3.0.5
• engine.io version: ~4.0.6
• ws version: ~7.4.2

v3.0.4

Compare Source

Links:

• Diff: socketio/socket.io@3.0.3...3.0.4
• Client release: 3.0.4
• engine.io version: ~4.0.0
• ws version: ^7.1.2

v3.0.3

Compare Source

Links:

• Diff: socketio/socket.io@3.0.2...3.0.3
• Client release: 3.0.3
• engine.io version: ~4.0.0
• ws version: ^7.1.2

v3.0.2

Compare Source

Bug Fixes

• merge Engine.IO options (43705d7)

Links:

• Diff: socketio/socket.io@3.0.1...3.0.2
• Client release: 3.0.2
• engine.io version: ~4.0.0
• ws version: ^7.1.2

v3.0.1

Compare Source

Bug Fixes

• export ServerOptions and Namespace types (#​3684) (f62f180)
• typings: update the signature of the emit method (50671d9)

Links:

• Diff: socketio/socket.io@3.0.0...3.0.1
• Client release: 3.0.1
• engine.io version: ~4.0.0
• ws version: ^7.1.2

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