CVE-2022-51018

PocketMine-MP versions before 3.26.5 and 4.0.x before 4.0.5 lack input validation on book item NBT fields (page text length, page count, author/title length). A player with a writable book can craft oversized NBT payloads ("book bombs"), causing excess bandwidth consumption and server crashes by ...

EUVD-2022-56047

PocketMine-MP before 3.26.5 and 4.0.x before 4.0.5 does not limit book page text length, page count, or author/title length. A player who obtains a writable book can create oversized NBT 'book bombs', causing excess bandwidth consumption and server crashes exceeding the 1 MB chunk size limit when...

Book page text, count, and author/title length is not limited in PocketMine-MP

Impact Players can fill book pages with as many characters as they like; the server does not check this. In addition, the maximum of 50 pages is also not enforced, meaning that players can create "book bombs". This causes a variety of problems: - Oversized NBT on the wire costing excess bandwidth...