1.8.4^[1] is an update to Minecraft which was released on April 17, 2015,^[2] to fix various exploits and important security vulnerabilities,^[3][4][5] as well as some other minor issues. 1.8.4 is compatible with 1.8 – 1.8.3 servers.^[6]

Changes

Mobs

Ocelots and wolves

• No longer follow players in Spectator mode.

Gameplay

Nether portal

• Traveling through no longer places the player outside the portal.^[7]

General

Skin customization.

• Player head skins can no longer be loaded from arbitrary servers.^[8]
  • They must now be loaded from the official Mojang servers.
• Player head skin files are now required to be a .png file.

Fixes

14 issues fixed

From released versions before 1.8

• MC-10979 – Hardcore single player has repeating screens and weird links.

From 1.8

• MC-46771 – Pets follow player in Spectator.
• MC-61758 – Vines no longer spread correctly in corners.
• MC-61895 – Crash when putting the default spawn egg in monster spawner.
• MC-68642 – Certain characters cannot be typed on certain keyboard layouts ("AltGr" behaving like "Ctrl").

From 1.8.1

• MC-73504 – Nether portals place players two blocks beside the portal.
• MC-77371 – Mac OS X weird keyboard when native Fullscreen.
• MC-78020 – "User (formerly known as olduser) has joined" shows multiple times.

From 1.8.3

• MC-78491 – Custom player heads exposing player's IP address.
• MC-79152 – Security vulnerabilities involving skulls.
• MC-79468 – 3D item model glitch.
• MC-79612 – NBT accounting incorrectly allows for giant allocations of empty lists.

Private issues

• MC-78495 – Duplicating items^[2]
• MC-79079 – Malicious clients can force a server to freeze.^[2]

Video

Video made by slicedlime:

References