CVE-2026-6219: ytDownloader Command Injection Vulnerability

CVE-2026-6219 Overview

A command injection vulnerability has been identified in aandrew-me ytDownloader, a popular media downloading application. The vulnerability exists in the child_process.exec function within the src/compressor.js file, specifically in the Compressor Feature component. When exploited, an attacker with local access can inject arbitrary commands through the application, potentially leading to unauthorized command execution on the affected system.

Critical Impact

Local attackers can execute arbitrary commands on the system through the ytDownloader Compressor Feature, potentially compromising system integrity and confidentiality.

Affected Products

• aandrew-me ytDownloader up to version 3.20.2

Discovery Timeline

• April 13, 2026 - CVE-2026-6219 published to NVD
• April 13, 2026 - Last updated in NVD database

Technical Details for CVE-2026-6219

Vulnerability Analysis

This command injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs within the Compressor Feature of ytDownloader. The application uses the Node.js child_process.exec function in src/compressor.js without proper sanitization of user-controlled input. When processing media files for compression, the application constructs shell commands that include user-supplied data, allowing an attacker to inject malicious commands into the execution flow.

The local attack vector requires the attacker to have access to the system where ytDownloader is installed. The exploit has been publicly disclosed, as documented in the GitHub Gist Security Note and PoC video demonstration.

Root Cause

The root cause of this vulnerability is the improper handling of user-supplied input when constructing shell commands in the child_process.exec function. The application fails to properly sanitize or escape special characters and command separators before passing data to the shell interpreter, enabling command injection attacks.

Attack Vector

The attack requires local access to the target system where ytDownloader is installed. An attacker can exploit this vulnerability by providing specially crafted input to the Compressor Feature that includes shell metacharacters or command separators. When the application processes this input through child_process.exec, the injected commands are executed with the privileges of the application process.

The vulnerability mechanism involves unsanitized input being passed directly to shell execution. Technical details and a proof-of-concept demonstration are available in the security advisory and VulDB entry.

Detection Methods for CVE-2026-6219

Indicators of Compromise

• Unusual process spawning from ytDownloader application processes
• Unexpected child processes executing shell commands from compressor.js
• Anomalous file system modifications or network connections initiated by ytDownloader
• Presence of command injection payloads in application logs or input files

Detection Strategies

• Monitor process execution chains for suspicious child processes spawned by Node.js or Electron-based applications
• Implement file integrity monitoring on the ytDownloader installation directory
• Review application logs for unusual input patterns containing shell metacharacters
• Deploy endpoint detection rules to identify command injection attempts targeting media processing applications

Monitoring Recommendations

• Enable detailed logging for the ytDownloader application to capture input processing events
• Configure SentinelOne to monitor for suspicious child_process.exec invocations from Node.js applications
• Implement behavioral analysis to detect anomalous command execution patterns
• Set up alerts for any shell command execution originating from media compression workflows

How to Mitigate CVE-2026-6219

Immediate Actions Required

• Restrict access to systems running vulnerable versions of ytDownloader
• Limit the application's execution privileges to reduce the impact of potential exploitation
• Consider temporarily disabling the Compressor Feature until a patch is available
• Apply the principle of least privilege to user accounts that run ytDownloader

Patch Information

The vendor was contacted about this disclosure. Users should monitor the official ytDownloader repository for security updates. Upgrade to a patched version as soon as one becomes available that addresses the command injection vulnerability in src/compressor.js.

Workarounds

• Avoid using the Compressor Feature on untrusted or potentially malicious media files
• Run ytDownloader in a sandboxed environment or container to limit the impact of command execution
• Implement application whitelisting to restrict what commands can be executed by the application
• Use external compression tools that have been audited for security instead of the built-in Compressor Feature

# Restrict ytDownloader execution to a sandboxed user
# Create dedicated user with limited privileges
sudo useradd -r -s /bin/false ytdownloader-user

# Run application with reduced permissions
sudo -u ytdownloader-user /path/to/ytDownloader