---
id: CVE-2026-42805
title: >-
  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)
summary: "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). \r\n\r\nThe function parses FIFO events a…"
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
vendor: Bosch Sensortec
product: BHI385 SensorAPI (C Library)
affected:
  - bhi385_sensorapi_c_library >= 1.1.0 <= 2.1.0
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T16:17:12.170'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42805'
references:
  - url: 'https://psirt.bosch.com/security-advisories/BOSCH-SA-223618.html'
    label: psirt@bosch.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-10T15:01:13.115369Z'
ingestedAt: '2026-09-10T09:45:12.028Z'
epss: 0.00191
epssPercentile: 0.0776
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.