CVE-2026-86200

PocketMine-MP versions before 5.42.1 contain a denial-of-service vulnerability in the LoginPacket handler. An unauthenticated remote attacker can craft malicious login packets with excessive unknown properties injected into the clientData JWT , causing the server to flood warning messages and was...

CVE-2026-86200 PocketMine-MP before 5.42.1 LogDoS via LoginPacket clientData JWT

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...

CVE-2026-86200: Logging of Excessive Data

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...

PT-2026-89003

Name of the Vulnerable Software and Affected Versions PocketMine-MP versions prior to 5.42.1 Description A denial of service issue exists in the LoginPacket handler. Remote attackers can inject numerous junk properties into the clientData JWT JSON Web Token, which is a compact, URL-safe means of...

PT-2026-35190

Impact Attackers can fill the body of the clientData JWT in LoginPacket with lots of junk properties, causing the server to flood warning messages, as well as wasting CPU time. This happens because the JsonMapper instance used to process the JWT body is configured to warn on unexpected properties...

PT-2026-33389

Impact Attackers can put large and/or complex structures as a value to an unknown property in the clientData JWT body in the Minecraft LoginPacket, causing the server to generate very long log messages. Additionally, the property name is logged without any length limitations or sanitization, whic...