# CVE-2026-42805

## Summary

- **CVE ID:** CVE-2026-42805
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-121
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 10, 2026

## Description

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.

## Affected Products

- Bosch Sensortec — BHI385 SensorAPI (C Library) (1.1.0)

## References

- [CNA](https://psirt.bosch.com/security-advisories/BOSCH-SA-223618.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.8

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._