CVE-2026-86201Public exploitNetwork attack vector

Server crash via unbounded LoginPacket property logging

Published Sep 9, 2026 · Updated Sep 9, 2026

Uncontrolled resource consumption in PMMP PocketMine-MP before 5.41.1 allows remote attackers to crash servers via crafted LoginPackets. The LoginPacket handler logs unknown clientData JWT values with var_export, serializing attacker-controlled nested or massive structures without a size limit. Publicly reachable servers require no authenticated session, and successful exploitation exhausts memory and interrupts the server process.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in PMMP PocketMine-MP before 5.41.1 allows remote attackers to crash servers via crafted LoginPackets. The LoginPacket handler logs unknown clientData JWT values with var_export, serializing attacker-controlled nested or massive structures without a size limit. Publicly reachable servers require no authenticated session, and successful exploitation exhausts memory and interrupts the server process.

The record

CVE
CVE-2026-86201
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
PMMP
Product
PocketMine-MP
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <5.41.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PMMP · PocketMine-MPversion=0 <5.41.1

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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