GHSA-xp4f-g2cm-rhg7: pocketmine/pocketmine-mp (CVE-2026-86200)

Package	Ecosystem	Affected	Fixed in
pocketmine/pocketmine-mp	Packagist	<5.42.1	5.42.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

PocketMine-MP versions before 5.42.1 are affected by a log denial-of-service issue in how the client data JWT in LoginPacket is processed. An attacker who can reach a publicly exposed server can send a JWT body containing many unknown properties, which causes the server to flood warning messages and waste CPU time. The source says this is fixed in 5.42.1, which limits unknown properties to 10 and rejects the packet when that limit is exceeded, so upgrade to 5.42.1 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.9	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0064, the 50th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:56 UTC First seen by agentprime
31 Oct 2026, 13:56 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.