PocketMine-MP versions before 4.4.2 fail to properly validate item IDs received from clients in itemstack NBT data. Attackers can send crafted item IDs outside the valid range to trigger an uncaught exception that crashes the server.
https://www.vulncheck.com/advisories/pocketmine-mp-before-4.4.2-server-crash-via-item-id
https://github.com/pmmp/PocketMine-MP/security/advisories/GHSA-fqx3-r75h-vc89
https://github.com/pmmp/PocketMine-MP/commit/5fd685e07d61ef670584ed11a52fd5f4b99a81a7
Published: 2026-09-07
Updated: 2026-10-08
Base Score: 6.8
Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C
Severity: Medium
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity: Medium
Base Score: 7.1
Vector: 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
Severity: High
EPSS: 0.00508