Bosch Sensortec BME690 SensorAPI up to 1.0.3 Field Data Parsing bme69x.c read_all_field_data gas_index out-of-bounds

Summaryinfo

A vulnerability categorized as critical has been discovered in Bosch Sensortec BME690 SensorAPI up to 1.0.3. This impacts the function read_all_field_data of the file bme69x.c of the component Field Data Parsing. Executing a manipulation of the argument gas_index can lead to out-of-bounds. The identification of this vulnerability is CVE-2026-42806. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Bosch Sensortec BME690 SensorAPI up to 1.0.3. This vulnerability affects the function read_all_field_data of the file bme69x.c of the component Field Data Parsing. The manipulation of the argument gas_index with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An out-of-bounds read vulnerability was discovered in the Bosch BME690 SensorAPI (C-driver) in version v1.0.3 and prior, specifically within the field data parsing logic in read_all_field_data (bme69x.c). The driver prefetches heater configuration registers into a contiguous 30-byte stack buffer (set_val) mapping IDAC, RES_HEAT, and GAS_WAIT tables. When parsing sensor field data, the gas_index is extracted using a 4-bit mask (0..15) but lacks boundary verification against the valid range (0..9). An attacker or a compromised peripheral mimicking a sensor on the I2C/SPI bus could return a payload with a gas index value of 10 or higher. This causes the driver to perform an out-of-bounds array access (set_val[20 + gas_index]), reading up to 6 bytes past the stack buffer. The leaked out-of-bounds byte is then written into the public gas_wait field, which may lead to measurement corruption or leak adjacent stack memory when telemetered or logged.

The advisory is shared for download at psirt.bosch.com. This vulnerability was named CVE-2026-42806 since 04/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Bosch Sensortec

Name

• BME690 SensorAPI

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

License

• commercial

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion