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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
pmmp PocketMine-MP unaffected
Version Status Constraints
0 affected < 5.41.1
5.41.1 unaffected —

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Wed, 09 Sep 2026 13:45:00 +0000

Type Values Removed Values Added
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.
Title PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-09T13:32:02.506Z

Reserved: 2026-09-05T11:52:36.821Z

Link: CVE-2026-86201

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-09T14:17:21.263

Modified: 2026-09-09T14:17:21.263

Link: CVE-2026-86201

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T16:00:17Z

Weaknesses