# CVE-2022-51018

## Summary

- **CVE ID:** CVE-2022-51018
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-400
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 8, 2026

## Description

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 (3.0.0)
- pmmp — PocketMine-MP (3.26.5)
- pmmp — PocketMine-MP (4.0.0)
- pmmp — PocketMine-MP (4.0.5)

## References

- [CNA](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-p62j-hrxm-xcxf)
- [CNA](https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-input-validation-via-book-pages)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 35.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._