CVE-2026-25933: Arduino App Lab RCE Vulnerability

CVE-2026-25933 Overview

CVE-2026-25933 is a command injection vulnerability (CWE-78) identified in Arduino App Lab, a cross-platform IDE for developing Arduino applications. The vulnerability exists in the Terminal component due to insufficient sanitization and validation of input data received from connected hardware devices, specifically in the _info.Serial and _info.Address metadata fields.

Critical Impact

An attacker with physical access to a tampered Arduino board can achieve arbitrary command execution with the privileges of the user running Arduino App Lab, potentially leading to full system compromise.

Affected Products

• Arduino App Lab versions prior to 0.4.0
• Cross-platform installations (Windows, macOS, Linux)
• Systems with connected Arduino hardware devices

Discovery Timeline

• February 12, 2026 - CVE-2026-25933 published to NVD
• February 12, 2026 - Last updated in NVD database

Technical Details for CVE-2026-25933

Vulnerability Analysis

The vulnerability exists within the device information handling mechanism of Arduino App Lab's Terminal component. When an Arduino board is connected to a host system, the application automatically collects identifying attributes from the hardware to establish a terminal session. This process reads metadata fields including the serial number (_info.Serial) and hardware address (_info.Address) directly from the connected device.

The root issue is that the application fails to enforce strict input validation on these parameters before processing them. This creates an opportunity for shell metacharacter injection, where specially crafted strings stored on a tampered board can break out of the intended context and execute arbitrary commands on the host system.

Root Cause

The vulnerability stems from improper input validation (CWE-78: Improper Neutralization of Special Elements used in an OS Command). The Terminal component processes the _info.Serial and _info.Address fields without adequately sanitizing them for shell metacharacters such as ;, |, &, $(), and backticks. When these values are subsequently used in command construction or shell operations, any embedded malicious payloads are interpreted and executed by the underlying operating system.

Attack Vector

Exploitation of this vulnerability requires physical access to the target system and a previously tampered Arduino board. The attack scenario involves:

1. An attacker modifies the firmware or EEPROM of an Arduino board to store malicious payloads in the Serial or Address metadata fields
2. The tampered board is connected to a victim's system running Arduino App Lab
3. When the application queries the board for device information, it reads the malicious metadata
4. The unsanitized values containing shell metacharacters are processed by the Terminal component
5. The injected commands execute with the privileges of the user running the Arduino App Lab application

This physical access requirement and the need for user interaction (connecting the device) result in a higher attack complexity. However, successful exploitation provides the attacker with code execution capabilities on the host system. See the GitHub Security Advisory for additional technical details.

Detection Methods for CVE-2026-25933

Indicators of Compromise

• Unexpected process spawning from Arduino App Lab application processes
• Unusual command-line arguments or shell invocations originating from the IDE
• Network connections initiated by child processes of the Arduino App Lab application
• Suspicious file system modifications following Arduino board connections

Detection Strategies

• Monitor for anomalous child process creation from Arduino App Lab executables
• Implement endpoint detection rules for shell metacharacter patterns in device enumeration logs
• Deploy application-level logging to capture device metadata fields during connection events
• Use SentinelOne's behavioral AI to detect command injection exploitation patterns

Monitoring Recommendations

• Enable detailed logging for USB device connection events on workstations running Arduino App Lab
• Monitor for execution of unexpected shell commands with the Arduino App Lab process as parent
• Track file integrity of Arduino App Lab installation directories for unauthorized modifications
• Review audit logs for privilege escalation attempts following IDE usage sessions

How to Mitigate CVE-2026-25933

Immediate Actions Required

• Upgrade Arduino App Lab to version 0.4.0 or later immediately
• Verify the integrity and source of all Arduino boards before connecting to development systems
• Restrict USB device connections to trusted and verified hardware only
• Run Arduino App Lab with minimal user privileges to limit the impact of potential exploitation

Patch Information

Arduino has addressed this vulnerability in Arduino App Lab version 0.4.0. The fix implements proper input sanitization and validation for the _info.Serial and _info.Address metadata fields before they are processed by the Terminal component. Users should update to the patched version available at the official GitHub release.

Workarounds

• If immediate patching is not possible, avoid connecting untrusted or unverified Arduino boards to systems running vulnerable versions
• Implement USB device whitelisting to prevent unauthorized hardware from being recognized by the system
• Run Arduino App Lab in a sandboxed or virtualized environment to contain potential exploitation
• Disable automatic device enumeration features until the application can be updated

For environments where updating is not immediately feasible, consider running the IDE within a containerized or virtual machine environment to provide an additional isolation layer against potential command injection attacks.