ArduinoBLE: Memory corruption via malformed ATT write request (CVE-2026-47773) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-47773

ArduinoBLE: Memory corruption via malformed ATT write request

Answer in brief

CVE-2026-47773 records a Unknown severity vulnerability in ArduinoBLE: Memory corruption via malformed ATT write request. The current sources do not mark it as known exploited. The current feed maps arduino-libraries/ArduinoBLE (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps arduino-libraries/ArduinoBLE (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
arduino-libraries/ArduinoBLEgeneric	< 2.0.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for arduino-libraries/ArduinoBLE.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.