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Vulnerability record · CVE-2026-86201 · published 9 September 2026

CVE-2026-86201: Uncontrolled resource consumption vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.61% · top 52.9% CWE-400 · Uncontrolled resource consumption Deferred
8.7CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
14 Sep 2026Last modified by NVD

Description

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/pmmp/PocketMine-MP/commit/87d1c0cea09d972fd4c2fafb84dac2ecab7649f0
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h
https://www.vulncheck.com/advisories/pocketmine-mp-before-5.41.1-logdos-via-loginpacket-clientdata
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h

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Source: NIST National Vulnerability Database (record CVE-2026-86201), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.