CVE-2026-47773: CWE-131: Incorrect Calculation of Buffer Size in arduino-libraries ArduinoBLE
ArduinoBLE enables Bluetooth Low Energy connectivity on certain Arduino models. Versions prior to 2.0.2 contain a missing bounds check in the ATT layer write request handler that allows a remote, unauthenticated BLE client to corrupt memory in the ATTClass global object. Devices running ArduinoBLE with one or more characteristics configured with the BLEEncryption property are affected. The fix is included starting from the 2.0.2 release.
AI Analysis
Technical Summary
CVE-2026-47773 is a high-severity vulnerability in the ArduinoBLE library affecting versions before 2.0.2. The vulnerability arises from an incorrect calculation of buffer size (CWE-131) and a missing bounds check in the ATT layer write request handler. This allows a remote, unauthenticated BLE client to corrupt memory in the ATTClass global object, potentially leading to memory corruption issues. The vulnerability specifically impacts devices with characteristics configured with the BLEEncryption property. The issue is resolved in ArduinoBLE version 2.0.2.
Potential Impact
An unauthenticated remote BLE client can exploit this vulnerability to corrupt memory in the ATTClass global object on affected devices. This could lead to unpredictable behavior or potential denial of service. The CVSS 4.0 score is 7.2 (high), reflecting the network attack vector with low complexity and no privileges required, but with high impact on confidentiality and availability.
Mitigation Recommendations
Upgrade affected ArduinoBLE library versions to 2.0.2 or later where the vulnerability is fixed. No additional mitigation is required once the library is updated.
CVE-2026-47773: CWE-131: Incorrect Calculation of Buffer Size in arduino-libraries ArduinoBLE
Description
ArduinoBLE enables Bluetooth Low Energy connectivity on certain Arduino models. Versions prior to 2.0.2 contain a missing bounds check in the ATT layer write request handler that allows a remote, unauthenticated BLE client to corrupt memory in the ATTClass global object. Devices running ArduinoBLE with one or more characteristics configured with the BLEEncryption property are affected. The fix is included starting from the 2.0.2 release.
CVSS v4.0
Score 7.2high
Affected software
arduino-libraries
ArduinoBLE
pkg:github/arduino-libraries/ArduinoBLERun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-47773 is a high-severity vulnerability in the ArduinoBLE library affecting versions before 2.0.2. The vulnerability arises from an incorrect calculation of buffer size (CWE-131) and a missing bounds check in the ATT layer write request handler. This allows a remote, unauthenticated BLE client to corrupt memory in the ATTClass global object, potentially leading to memory corruption issues. The vulnerability specifically impacts devices with characteristics configured with the BLEEncryption property. The issue is resolved in ArduinoBLE version 2.0.2.
Potential Impact
An unauthenticated remote BLE client can exploit this vulnerability to corrupt memory in the ATTClass global object on affected devices. This could lead to unpredictable behavior or potential denial of service. The CVSS 4.0 score is 7.2 (high), reflecting the network attack vector with low complexity and no privileges required, but with high impact on confidentiality and availability.
Mitigation Recommendations
Upgrade affected ArduinoBLE library versions to 2.0.2 or later where the vulnerability is fixed. No additional mitigation is required once the library is updated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-19T22:36:16.882Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa4701a91cc7f3848aa73e8
Added to database: 09/11/2026, 21:18:18 UTC
Last enriched: 09/11/2026, 21:31:55 UTC
Last updated: 09/11/2026, 22:23:23 UTC
Views: 4
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