CVE-2026-86204: Pmmp Pocketmine-Mp

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

PocketMine-MP versions before 5.39.2 fail to limit JSON payload size in ModalFormResponsePacket handling, allowing authenticated players to cause denial of service. Attackers can send modal form response packets with massive JSON arrays to exhaust server memory and CPU resources, rendering the server unresponsive.

Affected products

• Pmmp Pocketmine-Mp: before 5.39.2 (fixed in 5.39.2)

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