Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-86204— PocketMine-MP before 5.39.2 Denial of Service via ModalFormResponsePacket

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 5.39.2 之前的版本在处理 ModalFormResponsePacket 时未对 JSON 载荷大小进行限制，导致经过身份验证的玩家可以触发服务拒绝（DoS）。攻击者可以发送包含巨大 JSON 数组的模态表单响应数据包，从而耗尽服务器的内存和 CPU 资源，使服务器变得无响应。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1298
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-86204

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 Denial of Service via ModalFormResponsePacket
Source: CVE Program / CVE List V5
Vulnerability Description
PocketMine-MP versions before 5.39.2 fail to limit JSON payload size in ModalFormResponsePacket handling, allowing authenticated players to cause denial of service. Attackers can send modal form response packets with massive JSON arrays to exhaust server memory and CPU resources, rendering the server unresponsive.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 ~ 5.39.2 -

II. Public POCs for CVE-2026-86204

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-86204

请登录查看更多情报信息。

Other References for CVE-2026-86204 (2)

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-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-2026-86204

No comments yet

Leave a comment