A vulnerability classified as critical was found in MZ Automation lib60870 up to 2.3.3/2.3.6 . Affected by this issue is the function HighPriorityASDUQueue_hasUnconfirmedIMessages . Such manipulation leads to heap-based buffer overflow. This vulnerability is listed as CVE-2026-51219 . The attack must be carried out from within the local network. There is no available exploit.