Stack data disclosure via unchecked gas index
Published Sep 10, 2026 · Updated Sep 10, 2026
Out-of-bounds read in Bosch Sensortec BME690 SensorAPI 1.0.1 through 1.0.3 allows physically proximate attackers to expose stack data. In read_all_field_data in bme69x.c, a four-bit gas_index selects set_val[20 + gas_index] without enforcing the valid 0–9 range, reading up to six bytes beyond the 30-byte buffer. Exploitation requires control of, or access to impersonate, an I2C or SPI sensor; the exposed byte enters gas_wait and can corrupt measurements or disclose adjacent stack memory through logs or telemetry.
Summary
What happened
Out-of-bounds read in Bosch Sensortec BME690 SensorAPI 1.0.1 through 1.0.3 allows physically proximate attackers to expose stack data. In read_all_field_data in bme69x.c, a four-bit gas_index selects set_val[20 + gas_index] without enforcing the valid 0–9 range, reading up to six bytes beyond the 30-byte buffer. Exploitation requires control of, or access to impersonate, an I2C or SPI sensor; the exposed byte enters gas_wait and can corrupt measurements or disclose adjacent stack memory through logs or telemetry.
The record
- CVE
- CVE-2026-42806
- Published
- Sep 10, 2026
- Updated
- Sep 10, 2026
- Vendor
- Bosch Sensortec GmbH
- Product
- BME690 SensorAPI
- Classifications
- CWE-125, T1200
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 10, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.0.1 <=1.0.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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Your stack
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