Improper input validation in PocketMine-MP - #VU125414
Published: May 30, 2023 / Updated: April 8, 2026
Vulnerability identifier: #VU125414
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in LoginPacket processing when parsing malformed JWT JSON. A remote attacker can send a specially crafted LoginPacket payload to cause a denial of service.
The issue is caused by a dependency vulnerability in netresearch/jsonmapper when mapping JSON arrays and objects onto scalar model properties such as strings.
Affected software
PocketMine-MP
Remediation
Install security update from vendor's website.
PocketMine-MP - addressed in versions 4.20.5, 4.21.1