CVE-2026-86200

Medium

Description

PocketMine-MP versions before 5.42.1 contain a denial of service vulnerability in the LoginPacket handler that allows remote attackers to flood warning messages by injecting numerous junk properties into the clientData JWT. Attackers can craft malicious login packets with excessive unknown properties to waste server CPU time and degrade performance.

SeverityMedium

CVSS5.3

Exploit probability—

ProductPocketmine/pocketmine-mp

PublishedSep 9, 2026

First seenSep 9, 2026

Weakness typeCWE-779CWE-779

How to fix

Update

pocketmine/pocketmine-mp5.42.1 or later

Patches

github.com/pmmp/PocketMine-MP/commit/c1d4a813fb8c21bfd8b9affd040da864b794df71

Vendor advisories

github.com/pmmp/PocketMine-MP/security/advisories/GHSA-xp4f-g2cm-rhg7

Affected products

Product	Affected versions	Fixed in
pocketmine/pocketmine-mpPackagist	v < 5.42.1	5.42.1

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