CVE-2026-86200: Pmmp Pocketmine-Mp

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

PocketMine-MP versions before 5.42.1 contain a denial of service vulnerability in the LoginPacket handler that allows remote attackers to flood warning messages by injecting numerous junk properties into the clientData JWT. Attackers can craft malicious login packets with excessive unknown properties to waste server CPU time and degrade performance.

Affected products

• Pmmp Pocketmine-Mp: before 5.42.1 (fixed in 5.42.1)

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