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CVE-2026-86203— PocketMine-MP before 5.39.2 Item Duplication via Despawn State

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 5.39.2之前版本存在资源管理错误漏洞，该漏洞源于处理客户端攻击数据包时未验证实体消失状态，攻击者可利用竞争条件攻击正在断开的玩家触发多个死亡处理程序，导致物品和经验多次掉落以进行复制。

CVSS 3.7 · Low EPSS 0.35% · P27 Updated Oct 08, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

Vendor	Product	Version Range	Status
pmmp	PocketMine-MP	`< 5.39.2`	affected
		`5.39.2`	unaffected

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I. Basic Information for CVE-2026-86203

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 5.39.2 Item Duplication via Despawn State

Source: CVE Program / CVE List V5

Vulnerability Description

PocketMine-MP versions before 5.39.2 fail to validate entity despawn state when processing attack packets from clients. Attackers can exploit a race condition by attacking a disconnecting player to trigger multiple death handlers, causing inventory items and experience to drop multiple times for duplication.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

在生命周期中对资源的控制不恰当

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 ~ 5.39.2	-

II. Public POCs for CVE-2026-86203

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-86203

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Patches & Fixes for CVE-2026-86203 (1)

🔗 Duct tape for flagged-for-despawn player entities responding to actions · pmmp/PocketMine-MP@c0719b7 · GitHub Read full article patch

Vendor Advisories for CVE-2026-86203 (2)

https://www.cve.org/CVERecord?id=CVE-2026-86203

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-2026-86201	7.5 HIGH	PocketMine-MP before 5.41.1 LogDoS via LoginPacket clientData
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

IV. Related Vulnerabilities

Same product: PocketMine-MP

Same vendor: pmmp

Same weakness: CWE-664