CVE-2026-42804 Memory corruption in BHI360 SensorAPI (C-Library)
A stack-based buffer overflow in the Bosch BHI360 SensorAPI allows attackers to execute arbitrary code or cause denial of service via crafted debug frames.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42804?
CVE-2026-42804 is a high-severity memory corruption vulnerability in Bosch Sensortec BHI360_SensorAPI (C-Library), published on 10 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack-based buffer overflow vulnerability exists in the Bosch Sensortec BHI360 SensorAPI(C-Library) in versions up to and including commit d6b200416a. The vulnerability is located within the FIFO parsing and debug logging subsystem inside the function bhi360_parse_debug_message() in bhi360_parse.c (lines 1852-1875). The parser trusts the first payload byte of a debug frame as the message length (msg_length) and copies that many bytes into a fixed-size 17-byte stack buffer (debug_msg) via memcpy without performing any bounds checking. A locally or physically positioned attacker (e.g., via a malicious sensor, counterfeit hardware module, or a Man-in-the-Middle on the communication bus) can exploit this vulnerability by injecting a crafted debug frame with a length byte exceeding 16. This corrupts adjacent stack data, including the saved return address. Furthermore, because the overflowed buffer is subsequently passed to a printf-style logging sink, the attacker can supply format string specifiers (e.g., %n) to execute arbitrary code on the host microcontroller/SoC or cause a reliable system crash (Denial of Service).
Weakness: CWE-121
Which versions are affected by CVE-2026-42804?
How do I fix CVE-2026-42804?
No fix has been published for CVE-2026-42804 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-42804 being exploited?
There is no known exploitation of CVE-2026-42804 in the wild and no public exploit code.
Sources
Also known as GHSA-6jqh-27cv-xqr6.