CVE-2026-86201

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductPocketmine/pocketmine-mp

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update

pocketmine/pocketmine-mp5.41.1 or later

Patches

github.com/pmmp/PocketMine-MP/commit/87d1c0cea09d972fd4c2fafb84dac2ecab7649f0

Vendor advisories

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-h6rj-3m53-887h

Affected products

Product	Affected versions	Fixed in
pocketmine/pocketmine-mpPackagist	v < 5.41.1	5.41.1

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