Vulnerability · Published Sep 7, 2026 · Assigned by VulnCheck

CVE-2022-51018PocketMine-MP before 3.26.5 and 4.0.5 Input Validation via Book Pages

Medium 6.5

In plain English

A medium-severity uncontrolled resource consumption in PocketMine-MP from pmmp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 62.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	pocketmine/pocketmine-mp	3.26.5	GHSA-p62j-hrxm-xcxf
Packagist	pocketmine/pocketmine-mp	4.0.5	GHSA-p62j-hrxm-xcxf

Affected products (as reported)

Vendor	Product	Versions
pmmp	PocketMine-MP	3.0.0 – before 3.26.54.0.0 – before 4.0.5

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-p62j-hrxm-xcxf) vendor-advisory
VulnCheck Advisory: PocketMine-MP before 3.26.5 Input Validation via Book Pages third-party-advisory