CVE-2023-54392

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductPocketmine/pocketmine-mp

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

pocketmine/pocketmine-mp4.22.3, 5.2.1 or later

Patches

github.com/pmmp/PocketMine-MP/commit/0c250a2ef09627b48aa52302f6cc7e1f2afb70ea

Vendor advisories

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7wrv-6h42-w54f

Affected products

Product	Affected versions	Fixed in
pocketmine/pocketmine-mpPackagist	4.20.0 ≤ v < 4.22.3, 5.0.0 ≤ v < 5.2.1	4.22.3, 5.2.1

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