CVE-2026-86200: Logging of Excessive Data in pmmp PocketMine-MP
PocketMine-MP versions before 5.42.1 have a denial of service vulnerability in the LoginPacket handler. Remote attackers can exploit this by sending login packets with numerous junk properties in the clientData JWT, causing excessive logging and CPU usage. This degrades server performance and can lead to denial of service conditions.
AI Analysis
Technical Summary
CVE-2026-86200 describes a denial of service vulnerability in PocketMine-MP prior to version 5.42.1. The flaw exists in the LoginPacket handler where attackers can inject many unknown properties into the clientData JWT. This causes the server to log excessive warning messages and consume excessive CPU resources, degrading performance and potentially causing service disruption.
Potential Impact
The vulnerability allows remote attackers to cause denial of service by flooding the server with malicious login packets containing excessive junk properties. This results in high CPU usage due to excessive logging, leading to degraded server performance and potential service outages.
Mitigation Recommendations
No official patch or remediation has been confirmed yet. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting the rate of login attempts or implementing network-level protections to mitigate excessive login packet flooding.
CVE-2026-86200: Logging of Excessive Data in pmmp PocketMine-MP
Description
PocketMine-MP versions before 5.42.1 have a denial of service vulnerability in the LoginPacket handler. Remote attackers can exploit this by sending login packets with numerous junk properties in the clientData JWT, causing excessive logging and CPU usage. This degrades server performance and can lead to denial of service conditions.
CVSS v4.0
Score 6.9medium
Affected software
pkg:github/pmmp/PocketMine-MPRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-86200 describes a denial of service vulnerability in PocketMine-MP prior to version 5.42.1. The flaw exists in the LoginPacket handler where attackers can inject many unknown properties into the clientData JWT. This causes the server to log excessive warning messages and consume excessive CPU resources, degrading performance and potentially causing service disruption.
Potential Impact
The vulnerability allows remote attackers to cause denial of service by flooding the server with malicious login packets containing excessive junk properties. This results in high CPU usage due to excessive logging, leading to degraded server performance and potential service outages.
Mitigation Recommendations
No official patch or remediation has been confirmed yet. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting the rate of login attempts or implementing network-level protections to mitigate excessive login packet flooding.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-05T11:52:36.821Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa164b2acd9273b496858fe
Added to database: 09/09/2026, 13:52:50 UTC
Last enriched: 09/09/2026, 14:24:01 UTC
Last updated: 09/09/2026, 23:30:55 UTC
Views: 7
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