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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.

PocketMine-MP 5.41.1 之前的版本存在一个拒绝服务（DoS）漏洞，该漏洞位于 的处理过程中：当客户端数据中的 JWT 属性包含未知且结构庞大或复杂时，系统会触发未经净化的过度日志记录，从而可能导致服务器因内存溢出而崩溃。攻击者可以构造特殊的 ，其中包含深度嵌套或超大对象结构，以触发内存耗尽条件，导致服务器崩溃。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-86201

Vulnerability Information
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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

Affected Products

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

II. Public POCs for CVE-2026-86201

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III. Intelligence Information for CVE-2026-86201

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Other References for CVE-2026-86201 (3)

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

V. Comments for CVE-2026-86201

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