Impact When handling form responses from the client ("ModalFormResponsePacket"), the Minecraft Windows client may send weird JSON that "json_decode()" can't understand. A workaround for this is implemented in "InGamePacketHandler::stupid_json_decode()". An "InvalidArgumentException" is thrown by this function when it fails to fix an error found in the JSON, which is not caught by the caller. This leads to a server crash. Patches 56fe71d939c38fe14e18a31a673a9331bcc0e4ca Workarounds A plugin may handle "DataPacketReceiveEvent", capture "ModalFormResponsePacket" and run the provided JSON through "stupid_json_decode". Note that this requires copying the body of the function to a plugin, since the function is currently private. For more information If you have any questions or comments about this advisory: * Email us at "team@pmmp.io" (mailto:team@pmmp.io)