# CVE-2023-54392

## Summary

- **CVE ID:** CVE-2023-54392
- **Severity:** HIGH
- **CVSS Score:** 7.1 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-20
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

PocketMine-MP versions >= 4.20.0 before 4.22.3 (and before 5.2.1 in the 5.x branch) fail to validate NBT tag types in BlockActorDataPacket. A player can crash the server by sending a packet containing sign NBT data with an incorrect tag type, triggering an unhandled UnexpectedTagTypeException that terminates the server process.

## Affected Products

No affected products listed.

## References

- [CNA](https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7wrv-6h42-w54f)
- [CNA](https://github.com/pmmp/PocketMine-MP/commit/0c250a2ef09627b48aa52302f6cc7e1f2afb70ea)
- [CNA](https://www.vulncheck.com/advisories/pocketmine-mp-before-4.22.3-denial-of-service-via-blockactordatapacket)

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