---
id: CVE-2026-86199
title: >-
  PocketMine-MP versions before 5.43.1 fail to properly validate the Certificate
  field during offline login authentication
summary: >-
  PocketMine-MP versions before 5.43.1 fail to properly validate the Certificate
  field during offline login authentication. Unauthenticated players can trigger
  an uninitialized property access error that crashes the server.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-184
vendor: pmmp
product: PocketMine-MP
affected:
  - PocketMine-MP < 5.43.1
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:20:21.673'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86199'
references:
  - url: >-
      https://github.com/pmmp/PocketMine-MP/commit/8c75a1d739e8e190d3cc2338b25cebcc9c052b1b
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pmmp/PocketMine-MP/commit/e4aaef4ee0f769b52dc0347a1d6da403b9691115
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pocketmine-mp-before-5.43.1-denial-of-service-via-unauthenticated-login
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-g2fj-p69p-9chp
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-09T14:16:06.102661Z'
ingestedAt: '2026-09-09T14:11:29.381Z'
epss: 0.00467
epssPercentile: 0.37814
---

## Overview

PocketMine-MP versions before 5.43.1 fail to properly validate the Certificate field during offline login authentication. Unauthenticated players can trigger an uninitialized property access error that crashes the server.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.