CVE-2023-54393: Pmmp Pocketmine-Mp

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

PocketMine-MP versions before 4.20.5 contain a denial of service vulnerability in LoginPacket JSON parsing due to improper validation in the JsonMapper dependency. Attackers can send malformed JSON structures in LoginPacket to crash the server.

Affected products

• Pmmp Pocketmine-Mp: before 4.20.5 (fixed in 4.20.5); from 4.21.0, before 4.21.1 (fixed in 4.21.1)

Published 2026-09-09. Last modified 2026-10-08.