CVE-2023-54355: Pmmp Pocketmine-Mp

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

PocketMine-MP versions before 5.3.1 and 4.23.1 fail to validate that the identityPublicKey in LoginPacket uses the required secp384r1 elliptic curve. Attackers can provide LoginPackets with keys using different curves or non-EC key types to pass login verification but trigger an uncaught exception during ECDH key derivation, crashing the server.

Affected products

• Pmmp Pocketmine-Mp: before 4.23.1 (fixed in 4.23.1); from 5.2.0, before 5.3.1 (fixed in 5.3.1)

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