# CVE-2022-51017

## Summary

- **CVE ID:** CVE-2022-51017
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-20
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 8, 2026

## Description

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.

## Affected Products

- pmmp — PocketMine-MP (3.0.0)
- pmmp — PocketMine-MP (3.26.5)
- pmmp — PocketMine-MP (4.0.0)
- pmmp — PocketMine-MP (4.0.5)

## References

- [CNA](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-c6fg-99pr-25m9)
- [CNA](https://github.com/pmmp/PocketMine-MP/commit/958a9dbf0fe3131ab60319c5a939f5dfbfe5dfbb)
- [CNA](https://github.com/pmmp/PocketMine-MP/commit/6492cac5c10f9fa8443ceddd2191a7b65b73f601)
- [CNA](https://www.vulncheck.com/advisories/pocketmine-mp-before-3.26.5-and-4.0.5-denial-of-service-via-skin-data)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.47%
- **EPSS Percentile:** 39.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._