Executive Summary

CVE-2026-5972 is a command injection vulnerability found in the MetaGPT project, specifically in the Terminal.run_command() function. This function executes shell commands but uses a weak blocklist that only filters out two specific command substrings, leaving it vulnerable to arbitrary command execution.

Because the Terminal class is exposed as a tool callable by large language models (LLMs), an attacker can exploit prompt injection attacks to execute arbitrary shell commands remotely. The vulnerability allows dangerous commands like file deletion, downloading and executing malicious scripts, or running arbitrary Python code.

The vulnerability arises from insufficient input filtering and the direct writing of commands to a persistent bash shell's stdin without proper sanitization, enabling remote code execution (RCE).

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Impact Analysis

This vulnerability can have severe impacts including full system compromise. An attacker exploiting this flaw can execute arbitrary commands on the affected system remotely.

• Reading and writing sensitive files without authorization.
• Installing malware or backdoors on the system.
• Exfiltrating sensitive data.
• Performing lateral movement to other systems within the network.

Any user running MetaGPT with agentic workflows where the LLM can be influenced by external input is at risk.

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Detection Guidance

Detection of this vulnerability involves monitoring for unusual or unauthorized command executions that exploit the command injection flaw in the Terminal.run_command function.

Since the vulnerability allows remote code execution via LLM prompt injection, you can look for evidence of commands that bypass the weak blocklist, such as creation of unexpected files (e.g., files like /tmp/terminal_rce_proof.txt) or execution of commands like id, curl, or rm.

Suggested commands to detect exploitation attempts include:

• Check for suspicious files created by exploits: `ls -l /tmp/terminal_rce_proof.txt`
• Search system logs for unusual command executions or errors related to MetaGPT: `grep -i metagpt /var/log/syslog` or `journalctl -u metagpt`
• Monitor running processes for unexpected commands: `ps aux | grep -E 'curl|bash|python'`
• Use network monitoring tools to detect outbound connections initiated by suspicious commands: `netstat -tunp` or `ss -tunp`

Additionally, reviewing the MetaGPT logs or enabling verbose logging for the Terminal tool may help identify command injection attempts.

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Mitigation Strategies

The primary and recommended mitigation is to apply the official patch identified by commit d04ffc8dc67903e8b327f78ec121df5e190ffc7b, which introduces strict command validation and a safe command allowlist.

Key immediate mitigation steps include:

• Update MetaGPT to the patched version that implements a safe command allowlist, blocking dangerous commands and shell metacharacters.
• Disable or restrict the use of the Terminal.run_command function in environments where untrusted input can influence LLM prompts.
• Implement sandboxing or containerization to isolate command execution and limit potential damage from exploitation.
• Require explicit user approval before executing any shell commands triggered by LLM agents.
• Monitor systems for signs of exploitation attempts as described in detection steps.

These steps collectively reduce the risk of remote code execution and help secure the MetaGPT environment against this vulnerability.

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Compliance Impact

The vulnerability CVE-2026-5972 allows remote code execution through command injection in the MetaGPT project, potentially leading to unauthorized access to sensitive data and system compromise.

Such unauthorized access and potential data exfiltration could impact compliance with data protection regulations like GDPR and HIPAA, which require strict controls over data confidentiality, integrity, and system security.

If exploited, this vulnerability could lead to breaches involving personal or protected health information, thereby violating regulatory requirements and exposing organizations to legal and financial penalties.

Mitigation through patching and implementing strict command validation is essential to maintain compliance and reduce the risk of regulatory violations.

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