CVE-2026-86199: Incomplete List of Disallowed Inputs in pmmp PocketMine-MP
PocketMine-MP versions before 5.43.1 contain a vulnerability where the Certificate field is not properly validated during offline login authentication. This allows unauthenticated players to cause an uninitialized property access error, resulting in a server crash. The vulnerability has a high severity score of 8.7 and does not require user interaction or privileges to exploit.
AI Analysis
Technical Summary
CVE-2026-86199 affects PocketMine-MP versions prior to 5.43.1 by failing to properly validate the Certificate field during offline login authentication. This improper validation enables unauthenticated attackers to trigger an uninitialized property access error, causing the server to crash. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on availability.
Potential Impact
Exploitation of this vulnerability can cause a denial of service by crashing the PocketMine-MP server. Since no authentication or privileges are required, any unauthenticated player can trigger this condition remotely, potentially disrupting game availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting access to the server or implementing network-level protections to limit unauthenticated login attempts.
CVE-2026-86199: Incomplete List of Disallowed Inputs in pmmp PocketMine-MP
Description
PocketMine-MP versions before 5.43.1 contain a vulnerability where the Certificate field is not properly validated during offline login authentication. This allows unauthenticated players to cause an uninitialized property access error, resulting in a server crash. The vulnerability has a high severity score of 8.7 and does not require user interaction or privileges to exploit.
CVSS v4.0
Score 8.7high
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-2026-86199 affects PocketMine-MP versions prior to 5.43.1 by failing to properly validate the Certificate field during offline login authentication. This improper validation enables unauthenticated attackers to trigger an uninitialized property access error, causing the server to crash. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on availability.
Potential Impact
Exploitation of this vulnerability can cause a denial of service by crashing the PocketMine-MP server. Since no authentication or privileges are required, any unauthenticated player can trigger this condition remotely, potentially disrupting game availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider restricting access to the server or implementing network-level protections to limit unauthenticated login attempts.
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: 6aa164b2acd9273b496858fc
Added to database: 09/09/2026, 13:52:50 UTC
Last enriched: 09/09/2026, 14:22:55 UTC
Last updated: 09/09/2026, 23:30:53 UTC
Views: 7
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