CVE-2026-71256 — nanoMODBUS Client-Side Out-of-Bounds Read Leading to Wild-Pointer Write via object_id

Affected: debevv nanoMODBUS

nanoMODBUS through v1.23.0 contains an out-of-bounds stack read leading to a wild-pointer write in nmbs_read_device_identification_basic / recv_read_device_identification_res in nanomodbus.c. A fixed 3-element stack array order[3] = {0,1,2} maps object IDs to buffer indices. The server-supplied object_id field (0-255, read directly from the wire) is used without any bounds check as buf_index = order[object_id].

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CVE-2026-71256 — nanoMODBUS Client-Side Out-of-Bounds Read Leading to Wild-Pointer Write via object_id