---
id: CVE-2022-51017
title: >-
  PocketMine-MP versions before 3.26.5 and 4.0.5 fail to validate the length of
  skin data fields submitted by players, allowing uncapped values to exceed the
  32767 byte TAG_String limit
summary: >-
  PocketMine-MP versions before 3.26.5 and 4.0.5 fail to validate the length of
  skin data fields submitted by players, allowing uncapped values to exceed the
  32767 byte TAG_String limit. Attackers can submit oversized skin data fields
  like…
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-20
vendor: pmmp
product: PocketMine-MP
affected:
  - PocketMine-MP >= 3.0.0 < 3.26.5
  - PocketMine-MP >= 4.0.0 < 4.0.5
published: '2026-09-07'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:59:42.500'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-51017'
references:
  - url: >-
      https://github.com/pmmp/PocketMine-MP/commit/6492cac5c10f9fa8443ceddd2191a7b65b73f601
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pmmp/PocketMine-MP/commit/958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-c6fg-99pr-25m9
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-and-4.0.5-denial-of-service-via-skin-data
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00473
epssPercentile: 0.40121
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-08T12:52:24.624311Z'
ingestedAt: '2026-09-08T15:33:26.976Z'
---

## Overview

PocketMine-MP versions before 3.26.5 and 4.0.5 fail to validate the length of skin data fields submitted by players, allowing uncapped values to exceed the 32767 byte TAG_String limit. Attackers can submit oversized skin data fields like skinID or geometryName to trigger exceptions during NBT data serialization, causing server crashes.

## Remediation

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