Vulnerability · Published Sep 11, 2026 · Assigned by GitHub_M

CVE-2026-47773ArduinoBLE: Memory corruption via malformed ATT write request

High 7.2

In plain English

A high-severity out-of-bounds write in ArduinoBLE from arduino-libraries. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).

Severity (CVSS 4.0)7.2High

Exploit odds (30 days)0.1%top 95.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
arduino-libraries	ArduinoBLE	< 2.0.2

Weakness: CWE-131, CWE-787 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/arduino-libraries/ArduinoBLE/security/advisories/GHSA-77v6-cw9f-9whg x_refsource_CONFIRM
https://github.com/arduino-libraries/ArduinoBLE/pull/431/changes/1460e1a68221fca854b7b1e278cab76e763c00e6 x_refsource_MISC
https://github.com/arduino-libraries/ArduinoBLE/releases/tag/2.0.2 x_refsource_MISC