CVE-2026-86200
Published:September 09, 2026
Updated:September 22, 2026
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 Packages
https://github.com/pmmp/PocketMine-MP.git (GITHUB):
Affected version(s) >=5.0.0 <5.42.1Fix Suggestion:
Update to version 5.42.1pocketmine/pocketmine-mp (PHP):
Affected version(s) >=5.0.0 <5.42.1Fix Suggestion:
Update to version 5.42.1Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Logging of Excessive Data
EPSS
Base Score:
0.47