Issues

• Raise Engine.IO minimum to 6.6.10 for published security fixes

  socketio/socket.io#5571 · Filter by author rafadlis opened on Oct 11, 2026

• "Basic CRUD application" can't be started with Angular client

  to triage
  socketio/socket.io#5567 · Filter by author bubokko opened on Oct 5, 2026

• Connection State Recovery fails if client reconnects before server emits any events ("Zero-Event" reconnect)

  enhancement
  socketio/socket.io#5538 · Filter by author jml6m opened on Aug 21, 2026
  1

• RFC: Standard Schema validation and type inference for Socket.IO

  enhancement
  socketio/socket.io#5512 · Filter by author GermanJablo opened on Jun 11, 2026
  6

• Official documentation can't open

  needs investigation
  socketio/socket.io#5511 · Filter by author sourav-18 opened on Jun 11, 2026
  19

• A client receiving an Object with more than 10 binary fields closes the connection

  question
  socketio/socket.io#5504 · Filter by author guillaume-mueller opened on May 26, 2026
  4

• Can't set response headers in Server.handleUpgrade

  question
  socketio/socket.io#5497 · Filter by author weary-adventurer opened on May 11, 2026
  2

• WebTransport ignores query parameters in URL

  needs major releasequestion
  socketio/socket.io#5496 · Filter by author weary-adventurer opened on May 10, 2026 · 5.0.0
  3

• Heartbeat timeout is no longer reset on packet

  needs investigation
  socketio/socket.io#5450 · Filter by author streunerlein opened on Jan 24, 2026
  4

• Incorrect acknowledgment callback signature when emitting before connection with ackTimeout option

  needs major release
  socketio/socket.io#5446 · Filter by author rbgmulmb opened on Jan 18, 2026 · 5.0.0
  5

• Korean Docs Request

  documentationenhancement
  socketio/socket.io#5427 · Filter by author nayounsang opened on Dec 16, 2025
  1

• Send message to a Set<Room>

  enhancement
  socketio/socket.io#5418 · Filter by author floriannari opened on Nov 17, 2025

• TypeScript type breakage under pnpm / preserveSymlinks=true due to extending Emitter from another package

  needs investigation
  socketio/socket.io#5411 · Filter by author anthonyalayo opened on Nov 3, 2025
  2

• Leave multiple rooms at once

  enhancement
  socketio/socket.io#5391 · Filter by author ZachHaber opened on Sep 9, 2025
  4

• socket.io-client on the browser

  enhancementneeds author input
  socketio/socket.io#5383 · Filter by author sakgoyal opened on Aug 28, 2025
  3

• Publish to JSR

  enhancementneeds author input
  socketio/socket.io#5381 · Filter by author sakgoyal opened on Aug 25, 2025
  3

• WebSocket is closed before the connection is established.

  needs author inputneeds investigation
  socketio/socket.io#5371 · Filter by author hokamsingh opened on Jul 10, 2025
  1

• Issue: recv() failed (104: Connection reset by peer) while proxying/upgrading WebSocket in NGINX with Socket.IO

  needs investigation
  socketio/socket.io#5370 · Filter by author Naveen-Mallow opened on Jul 7, 2025
  3

• Connection State Recovery: Client->Server resync

  enhancement
  socketio/socket.io#5363 · Filter by author Bryght-Labs-Richard opened on Jun 23, 2025

• Long-lived connections experience false disconnections due to timer reliability issues

  to triage
  socketio/socket.io#5357 · Filter by author matiaslopezd opened on Jun 11, 2025
  3

• Pooled memory management currently impossible with socket.io interface

  enhancement
  socketio/socket.io#5353 · Filter by author bytenik opened on Jun 2, 2025
  7

• Enable logging in Angular

  enhancement
  socketio/socket.io#5351 · Filter by author christian3042 opened on May 18, 2025
  1

• Socket.IO not connecting in Chrome browser (HTTPS, custom port 6530)

  needs author input
  socketio/socket.io#5343 · Filter by author tirthgajjar087 opened on Apr 30, 2025
  1

• Issue with .to(room).emitWithAck()

  question
  socketio/socket.io#5333 · Filter by author terryluan12 opened on Apr 22, 2025
  3

• Errors when using uWebsockets while clients are connected and server restarts

  to triage
  socketio/socket.io#5330 · Filter by author GetThatCookie opened on Apr 17, 2025
  1