CVE-2026-71254

Descrição

nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus server-side handle_read_file_record function (FC 0x14, Read File Record) in nanomodbus.c. The function validates that the total request size does not exceed 245 bytes and that each sub-request-s record_length is at most 124, but it never validates the CUMULATIVE response size across all sub-requests before processing them.