CVE-2022-51018: Pmmp Pocketmine-Mp

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 saving region-based worlds in PM3, or exceeding the 32 KiB TAG_String limit in PM4).

Affected products

• Pmmp Pocketmine-Mp: from 3.0.0, before 3.26.5 (fixed in 3.26.5); from 4.0.0, before 4.0.5 (fixed in 4.0.5)

Published 2026-09-07. Last modified 2026-10-08.