If we use ./zabbix_get args
(Where args in xxd utility:
00000000: 2d70 7320 2d73 2031 3131 3131 3131 3131 -ps -s 111111111
00000010: 3131 3131 3131 31e8 033a 3b20 2d6b 2003 1111111..:;.-k..), then we got integer signed overflow in signed integer overflow zbx_is_ip4():

ip.c:41:18: runtime error: signed integer overflow: 1111111111 * 10 cannot be represented in type 'int'
#0 0x555555667da0 in zbx_is_ip4 /zabbixnew/zabbix/src/libs/zbxip/ip.c:41:18
#1 0x5555555c534a in zbx_socket_connect /zabbixnew/zabbix/src/libs/zbxcomms/comms.c:524:17
#2 0x5555555c6905 in zbx_socket_create /zabbixnew/zabbix/src/libs/zbxcomms/comms.c:661:17
#3 0x5555555c6833 in zbx_tcp_connect /zabbixnew/zabbix/src/libs/zbxcomms/comms.c:712:9
#4 0x5555555c2a84 in get_value /zabbixnew/zabbix/src/zabbix_get/zabbix_get.c:275:24
#5 0x5555555c1eb0 in main /zabbixnew/zabbix/src/zabbix_get/zabbix_get.c:605:8
Problem is actual for upstream version. You can accept PR for fix it:
https://github.com/zabbix/zabbix/pull/140

I use clang-19 with -fasnitize=UBSAN option. You were closed my previous Issue so fairly and I couldn't reply on your questions, but problem was approved.