CVE-2026-47773 ArduinoBLE: Memory corruption via malformed ATT write request
Remote attackers can corrupt memory in ArduinoBLE devices with encrypted characteristics, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-47773?
CVE-2026-47773 is a high-severity memory corruption vulnerability in arduino-libraries ArduinoBLE, published on 11 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-47773?
How do I fix CVE-2026-47773?
No fix has been published for CVE-2026-47773 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-47773 being exploited?
There is no known exploitation of CVE-2026-47773 in the wild and no public exploit code.
Sources
Also known as GHSA-77v6-cw9f-9whg.