Resource exhaustion in Pmmp Pocketmine-Mp
CVE-2026-86201
PocketMine-MP before 5.41.1 contains a denial of service vulnerability in LoginPacket processing where large or complex structures in unknown clientData JWT properties cause excessive logging without sanitization. Attackers can send crafted LoginPackets with deeply nested or massive object structures to trigger out-of-memory conditions and crash the server.
Vulnerability class: DoS (Denial of Service)
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-86201?
- CVE-2026-86201 is a high-severity vulnerability in Pmmp Pocketmine-Mp, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-09.
- How severe is CVE-2026-86201?
- High severity. CVSS v3 base score is 7.5 out of 10.