CVE-2026-71254 — nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()
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 v…
Published: 2026-08-05 · CVSS: 9.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7