Vulnerability · Published Sep 9, 2026 · Assigned by VulnCheck

CVE-2023-54392PocketMine-MP before 4.22.3 Denial of Service via BlockActorDataPacket

Medium 6.5

In plain English

A medium-severity improper input validation 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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 55.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

PocketMine-MP versions >= 4.20.0 before 4.22.3 (and before 5.2.1 in the 5.x branch) fail to validate NBT tag types in BlockActorDataPacket. A player can crash the server by sending a packet containing sign NBT data with an incorrect tag type, triggering an unhandled UnexpectedTagTypeException that terminates the server process.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	pocketmine/pocketmine-mp	4.22.3	GHSA-7wrv-6h42-w54f
Packagist	pocketmine/pocketmine-mp	5.2.1	GHSA-7wrv-6h42-w54f

Affected products (as reported)

Vendor	Product	Versions
pmmp	PocketMine-MP	4.20.0 – before 4.22.35.0.0 – before 5.2.1

Weakness: CWE-20 · 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-7wrv-6h42-w54f) vendor-advisory
Patch Commit patch
VulnCheck Advisory: PocketMine-MP before 4.22.3 Denial of Service via BlockActorDataPacket third-party-advisory