CVE-2026-5972: MetaGPT OS Command Injection Vulnerability

CVE-2026-5972 Overview

A critical OS command injection vulnerability has been identified in FoundationAgents MetaGPT, an autonomous AI agent framework. The vulnerability affects the Terminal.run_command function located in the metagpt/tools/libs/terminal.py library file. Due to improper input sanitization, attackers can inject and execute arbitrary operating system commands through manipulated input, potentially leading to complete system compromise.

Critical Impact

Remote attackers can execute arbitrary OS commands on systems running vulnerable versions of MetaGPT (up to version 0.8.1), potentially leading to data theft, system compromise, or lateral movement within affected networks.

Affected Products

• FoundationAgents MetaGPT versions up to and including 0.8.1
• Systems utilizing the metagpt/tools/libs/terminal.py library
• Applications integrating MetaGPT's Terminal functionality

Discovery Timeline

• April 9, 2026 - CVE-2026-5972 published to NVD
• April 9, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5972

Vulnerability Analysis

This vulnerability is classified as CWE-77 (Improper Neutralization of Special Elements used in a Command, commonly known as Command Injection). The Terminal.run_command function in MetaGPT fails to properly sanitize user-controlled input before incorporating it into system command execution. This design flaw allows attackers to break out of the intended command context and inject additional malicious commands that will be executed with the privileges of the running application.

The vulnerability is particularly concerning in AI agent frameworks like MetaGPT, as these systems often require elevated permissions to perform their intended tasks. An attacker who successfully exploits this vulnerability could leverage these permissions to conduct reconnaissance, exfiltrate data, install persistent backdoors, or pivot to other systems within the network.

Root Cause

The root cause of this vulnerability lies in the insufficient input validation and sanitization within the Terminal.run_command function. The function accepts user-supplied input and passes it directly to the underlying operating system shell for execution without properly escaping shell metacharacters or validating the input against an allowlist of permitted commands. This allows attackers to inject command separators (such as ;, &&, ||, or backticks) followed by arbitrary commands that will be executed alongside or instead of the intended command.

Attack Vector

The attack can be conducted remotely over the network without requiring authentication. An attacker can craft malicious input containing shell metacharacters and OS commands, then submit this input to any application endpoint that ultimately processes the data through the vulnerable Terminal.run_command function. The injected commands will be executed on the target system with the same privileges as the MetaGPT process.

The vulnerability has been disclosed publicly and exploit details may be available, increasing the risk of active exploitation. Organizations using affected versions should prioritize remediation.

Detection Methods for CVE-2026-5972

Indicators of Compromise

• Unusual command execution patterns originating from MetaGPT processes
• Suspicious shell metacharacters (;, &&, ||, backticks, $()) in application logs or input parameters
• Unexpected network connections or data exfiltration from systems running MetaGPT
• Anomalous process trees with MetaGPT as a parent process spawning unexpected child processes

Detection Strategies

• Monitor process execution logs for command injection patterns, particularly looking for shell metacharacters in command arguments
• Implement application-level logging to capture all inputs to the Terminal.run_command function
• Deploy behavioral analysis tools to detect anomalous command execution sequences
• Review system call traces for unexpected command execution from Python processes running MetaGPT

Monitoring Recommendations

• Enable comprehensive logging for all MetaGPT terminal operations and review logs regularly for suspicious patterns
• Configure security monitoring solutions to alert on command injection attempt signatures
• Implement network monitoring to detect unusual outbound connections from MetaGPT instances
• Use file integrity monitoring on critical system files to detect potential post-exploitation modifications

How to Mitigate CVE-2026-5972

Immediate Actions Required

• Update MetaGPT to a patched version that includes commit d04ffc8dc67903e8b327f78ec121df5e190ffc7b
• Review and audit all deployments using the Terminal.run_command function for potential exposure
• Implement network segmentation to limit the blast radius of potential compromises
• Consider temporarily disabling terminal functionality if not critical to operations

Patch Information

A security patch has been released to address this vulnerability. The fix is available in commit d04ffc8dc67903e8b327f78ec121df5e190ffc7b. Organizations should apply this patch immediately by updating to a version of MetaGPT that includes this commit. Additional technical details can be found in the GitHub issue tracker and the VulDB vulnerability detail page.

Workarounds

• Implement strict input validation at the application layer before any data reaches the Terminal.run_command function
• Use allowlist-based command filtering to restrict the commands that can be executed
• Run MetaGPT with minimal required privileges using the principle of least privilege
• Deploy web application firewalls (WAF) or input filtering proxies to detect and block command injection attempts

# Configuration example - Restrict MetaGPT process privileges
# Create dedicated user with minimal permissions
sudo useradd -r -s /bin/false metagpt-user

# Run MetaGPT with restricted privileges
sudo -u metagpt-user python -m metagpt

# Apply file system restrictions
chmod 750 /path/to/metagpt
chown root:metagpt-user /path/to/metagpt