CVE-2026-42805

A stack-based buffer overflow vulnerability exists in the Bosch Sensortec BHI385 SensorAPI (C library) within the debug message parser function bhi385 parse debug message (located in bhi385 parse.c).

The function parses FIFO events and extracts an 8-bit message length directly from the attacker-controlled event payload (callback info->data ptr[0]) without enforcing bounds checks or clamping the value.

When copying the payload into a fixed-size stack buffer of 17 bytes (uint8 t debug msg[17]) via memcpy, providing a length byte greater than 16 causes the function to write past the allocated stack boundary.

This memory corruption can be triggered by a malicious or compromised sensor or bus participant, leading to a firmware crash, Denial of Service (DoS), or potentially the execution of arbitrary code via adjacent stack data corruption.