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CVE-2026-86201— PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData

Quick assessment

Affected

pmmp PocketMine-MP

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PMMP PocketMine-MP是PMMP团队开源的一款基岩版游戏服务器软件。 PMMP PocketMine-MP 5.41.1之前版本存在资源管理错误漏洞，该漏洞源于LoginPacket处理过程中对未知clientData JWT属性中的大型或复杂结构记录日志时未进行清理，可能导致攻击者发送特制的LoginPacket触发内存耗尽并使服务器崩溃。

CVSS 7.5 · High EPSS 0.61% · P49 Updated Oct 08, 2026

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

Vendor	Product	Version Range	Status
pmmp	PocketMine-MP	`< 5.41.1`	affected
		`5.41.1`	unaffected

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I. Basic Information for CVE-2026-86201

Vulnerability Information

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title

PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Vulnerability Title

PMMP PocketMine-MP 资源管理错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
pmmp	PocketMine-MP	0 ~ 5.41.1	-

II. Public POCs for CVE-2026-86201

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-86201

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Patches & Fixes for CVE-2026-86201 (1)

🔗 LoginPacketHandler: make debug message less noisy · pmmp/PocketMine-MP@87d1c0c · GitHub Read full article patch

Vendor Advisories for CVE-2026-86201 (2)

https://www.cve.org/CVERecord?id=CVE-2026-86201

Same Patch Batch · pmmp · 2026-09-09 · 18 CVEs total

CVE-2024-58381	7.5 HIGH	PocketMine-MP before 5.11.1 Denial of Service via LoginPacket
CVE-2026-86199	7.5 HIGH	PocketMine-MP before 5.43.1 Denial of Service via unauthenticated login
CVE-2023-54390	7.5 HIGH	PocketMine-MP before 5.3.1 Denial of Service via LoginPacket
CVE-2023-54393	7.5 HIGH	PocketMine-MP before 4.20.5 Denial of Service via LoginPacket
CVE-2023-54355	7.5 HIGH	PocketMine-MP 5.2.0 Server Crash via Incorrect EC Curve
CVE-2023-54396	6.5 MEDIUM	PocketMine-MP before 4.8.1 Server Crash via Banner NBT
CVE-2023-54392	6.5 MEDIUM	PocketMine-MP before 4.22.3 Denial of Service via BlockActorDataPacket
CVE-2024-58380	6.5 MEDIUM	PocketMine-MP before 5.11.2 Denial of Service via BookEditPacket
CVE-2025-71417	6.5 MEDIUM	PocketMine-MP before 5.32.1 Denial of Service via ResourcePackClientResponsePacket
CVE-2026-86204	6.5 MEDIUM	PocketMine-MP before 5.39.2 Denial of Service via ModalFormResponsePacket
CVE-2025-71418	5.3 MEDIUM	PocketMine-MP before 5.25.2 Denial of Service via explode
CVE-2026-86200	5.3 MEDIUM	PocketMine-MP before 5.42.1 LogDoS via LoginPacket clientData JWT
CVE-2023-54395	4.3 MEDIUM	PocketMine-MP before 4.12.5 Denial of Service via ModalFormResponsePacket
CVE-2023-54394	4.3 MEDIUM	PocketMine-MP before 4.18.0-ALPHA2 Bandwidth Amplification via InventoryTransactionPacket
CVE-2026-86202	4.3 MEDIUM	PocketMine-MP before 5.39.2 Network Amplification via ActorEventPacket
CVE-2026-86198	4.2 MEDIUM	PocketMine-MP before 5.44.2 Denial of Service via ResourcePackClientResponsePacket
CVE-2026-86203	3.7 LOW	PocketMine-MP before 5.39.2 Item Duplication via Despawn State

IV. Related Vulnerabilities

Same product: PocketMine-MP

Same vendor: pmmp

Same weakness: CWE-400