CVE-2026-71263 [CRITICAL] – The LINUXTCP port of FreeModbus contains an off-by-one bounds check in xMBPortTCPPool (dem

The LINUXTCP port of FreeModbus contains an off-by-one bounds check in xMBPortTCPPool (demo/LINUXTCP/port/porttcp.c). The check uses a strict greater-than comparison instead of greater-than-or-equal against the 263-byte MB_TCP_BUF_SIZE limit.