CVE-2026-2544 Overview
A security flaw has been discovered in yued-fe LuLu UI up to version 3.0.0. This vulnerability affects the function child_process.exec of the file run.js, allowing OS command injection. The attack can be launched remotely without authentication. The vendor was contacted early about this disclosure but did not respond in any way.
Critical Impact
Remote attackers can inject arbitrary OS commands through the vulnerable child_process.exec function, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network.
Affected Products
- yued-fe LuLu UI up to version 3.0.0
Discovery Timeline
- February 16, 2026 - CVE-2026-2544 published to NVD
- February 18, 2026 - Last updated in NVD database
Technical Details for CVE-2026-2544
Vulnerability Analysis
This vulnerability is classified as CWE-77 (Improper Neutralization of Special Elements used in a Command). The flaw exists in the run.js file where the child_process.exec function is used without proper sanitization of user-controlled input. When user input is passed directly to the shell execution function, attackers can inject malicious commands by appending shell metacharacters such as semicolons (;), pipes (|), or command substitution operators.
The vulnerability is exploitable over the network without requiring any authentication or user interaction, making it accessible to remote attackers. While the immediate impact is limited to low confidentiality, integrity, and availability compromise according to the CVSS vector, successful exploitation could serve as an initial foothold for more severe attacks.
Root Cause
The root cause of this vulnerability is the improper handling of user-supplied input before passing it to the child_process.exec() function in Node.js. The run.js file fails to sanitize or validate input data, allowing shell metacharacters to be interpreted by the underlying operating system shell. This is a classic command injection pattern where untrusted data is concatenated into a command string that gets executed by the system shell.
Attack Vector
The attack vector is network-based, requiring no authentication or user interaction. An attacker can craft malicious input containing shell command separators or operators to execute arbitrary commands on the target system. For example, by appending ;whoami or $(id) to expected input, an attacker can chain additional commands that will be executed with the privileges of the Node.js process.
The vulnerability mechanism involves unsanitized input being passed to child_process.exec(), which spawns a shell to execute the command string. Unlike child_process.execFile() or child_process.spawn() with explicit argument arrays, exec() interprets the entire string through the shell, making it susceptible to injection attacks.
For detailed technical analysis and proof of concept information, refer to the GitHub CVE Discovery Guide and the VulDB CVE Report #346153.
Detection Methods for CVE-2026-2544
Indicators of Compromise
- Unexpected command execution logs or shell processes spawned by Node.js applications
- Network requests containing shell metacharacters (;, |, &, $(), backticks) in parameters
- Process trees showing node as parent of suspicious system commands like whoami, id, curl, or wget
- Anomalous outbound network connections from the application server
Detection Strategies
- Monitor application logs for unusual input patterns containing command injection payloads
- Implement web application firewall (WAF) rules to detect and block common command injection patterns
- Use process monitoring to alert on unexpected child processes spawned by the Node.js application
- Review audit logs for evidence of reconnaissance commands or data exfiltration attempts
Monitoring Recommendations
- Enable verbose logging for the LuLu UI application to capture all incoming requests
- Configure SIEM rules to correlate Node.js process execution with unusual child process spawning
- Monitor file system changes and network connections originating from the application process
- Establish baselines for normal application behavior to identify anomalous command execution
How to Mitigate CVE-2026-2544
Immediate Actions Required
- Assess whether LuLu UI version 3.0.0 or earlier is deployed in your environment
- Consider temporarily disabling or restricting access to the affected functionality until a patch is available
- Implement network-level access controls to limit exposure of the vulnerable component
- Deploy web application firewall rules to filter command injection attempts
Patch Information
At the time of publication, no official patch has been released by the vendor. The vendor was contacted about this vulnerability but did not respond. Organizations should monitor the VulDB entry and the project repository for any future security updates.
Workarounds
- Replace usage of child_process.exec() with child_process.execFile() or child_process.spawn() with explicit argument arrays to avoid shell interpretation
- Implement strict input validation and sanitization using allowlists for expected characters
- Apply the principle of least privilege to the Node.js process to limit the impact of successful exploitation
- Consider containerizing or sandboxing the application to restrict access to system resources
To mitigate command injection vulnerabilities in Node.js applications, the recommended approach is to avoid using child_process.exec() with user-controlled input. Instead, use child_process.execFile() or child_process.spawn() with an array of arguments, which bypasses shell interpretation entirely. Additionally, validate and sanitize all user input against strict allowlists before processing.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
