{"id":"CVE-2023-54392","title":"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","summary":"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 …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-20"],"vendor":"pmmp","product":"PocketMine-MP","affected":["PocketMine-MP"],"published":"2026-09-09","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:01.457","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-54392","references":[{"url":"https://github.com/pmmp/PocketMine-MP/commit/0c250a2ef09627b48aa52302f6cc7e1f2afb70ea","label":"disclosure@vulncheck.com"},{"url":"https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-7wrv-6h42-w54f","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pocketmine-mp-before-4.22.3-denial-of-service-via-blockactordatapacket","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"epss":0.00376,"epssPercentile":0.31342,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T17:08:38.588900Z"},"ingestedAt":"2026-09-09T14:11:29.381Z","slug":"CVE-2023-54392","body":"## Overview\n\nPocketMine-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}