WS-2022-0034
Published:January 23, 2022
Updated:October 07, 2026
When handling form responses from the client ("ModalFormResponsePacket"), the Minecraft Windows client may send weird JSON that "json_decode()" can't understand. A workaround for this is implemented in "InGamePacketHandler::stupid_json_decode()". An "InvalidArgumentException" is thrown by this function when it fails to fix an error found in the JSON, which is not caught by the caller. This leads to a server crash.
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Contact UsCVSS v4
Base Score:
8.7
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
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH