Name of the Vulnerable Software and Affected Versions: PocketMine-MP versions prior to 5.11.2

Description: The issue occurs when a client sends a BookEditPacket with an InventorySlot greater than 35, causing the server to crash due to an unhandled exception thrown by BaseInventory->getItem(). This results in a server crash, affecting all servers. The crash happens at the /network/mcpe/handler/InGamePacketHandler.php endpoint, specifically at line 873.

Recommendations: For versions prior to 5.11.2, update to version 5.11.2 or later to resolve the issue. As a temporary workaround, consider restricting the InventorySlot value to 35 or less to prevent the server crash.