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CVE-2026-42806

BME690 SensorAPI (C) · Vulnerability

CVSS 3.1 4.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-42806

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-42806

Published

BME690 SensorAPI (C)

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Bosch Sensortec",
                    "product": "BME690 SensorAPI (C)",
                    "versions": [
                        {
                            "version": "1.0.1",
                            "status": "affected",
                            "versionType": "custom",
                            "lessThanOrEqual": "1.0.3"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON