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 supp
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This CVE exploits attack patterns that Casky's 0matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2026-42804 is a stack-based buffer overflow vulnerability in the Bosch Sensortec BHI360 SensorAPI C-Library that affects embedded sensor processing systems. The flaw exists in the bhi360_parse_debug_message() function, where the parser unsafely trusts an untrusted payload byte as a message length value and copies that many bytes into a fixed 17-byte stack buffer without bounds checking. This allows an attacker to overflow the stack by crafting malicious debug frames with inflated length values, potentially enabling arbitrary code execution on systems running vulnerable versions up to commit d6b200416a. Organizations deploying BHI360 sensors in IoT devices, wearables, automotive systems, and industrial equipment face direct risk of compromise, particularly in supply chains where sensor firmware updates may lag.
While currently unmapped to MITRE ATT&CK techniques, Casky's Claude-powered analysis identifies this vulnerability as an exploitable entry point for code execution attacks. Practitioners using Casky would detect attack patterns associated with memory corruption techniques (CWE-121 stack-based buffer overflow) through extended reasoning across the platform's 754 mapped security skills. The analysis would highlight suspicious debug message processing, unexpected memory writes to stack regions, and potential shellcode execution paths. Security teams would see findings correlating to pre-exploitation reconnaissance of sensor firmware, crafting of oversized debug payloads, and post-exploitation lateral movement from compromised embedded devices into broader network infrastructure—enabling proactive threat hunting before CVE-2026-42804 becomes actively exploited.
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