---
id: CVE-2022-51018
title: >-
  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
summary: >-
  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 consumpti…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
vendor: pmmp
product: PocketMine-MP
affected:
  - PocketMine-MP >= 3.0.0 < 3.26.5
  - PocketMine-MP >= 4.0.0 < 4.0.5
published: '2026-09-07'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:16:36.593'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-51018'
references:
  - url: >-
      https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-p62j-hrxm-xcxf
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-input-validation-via-book-pages
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00417
epssPercentile: 0.3335
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T19:22:08.213076Z'
ingestedAt: '2026-09-08T15:33:26.976Z'
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.