External risk intelligence

CrewAI FileWriterTool Path Traversal Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-37007

The vulnerability exists in a library tool designed for file system operations within an AI agent framework. While it may be reachable if integrated into an internet-facing application or agent, the tool itself is a development component and not inherently an internet-facing gateway or edge service.

Path Traversal

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in a file writing tool within the crewai-tools library. This issue could allow a remote attacker to execute code by manipulating file paths. The primary concern is to confirm if this tool is integrated into any systems that could be exposed to external access, which would warrant further investigation into potential impact.

  • Malicious file path manipulation can lead to code execution.
  • Critical issue could affect AI agent framework operations.
  • Confirm relevance and exposure for this tool.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted filename to a file writing tool accessible over the network. This filename would contain path traversal sequences designed to trick the tool into writing files to unintended locations on the server. Successful exploitation could lead to the attacker executing arbitrary code with the privileges of the running application.

  • No authentication or user interaction needed.
  • Malicious filename argument triggers vulnerability.
  • Remote code execution leading to system compromise.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability in a file writing tool could allow remote attackers to execute code. This could occur when the tool handles filenames containing malicious path traversal sequences, potentially impacting the system where the tool is operating.

  • System files could be affected.
  • Malicious filenames could be used.
  • Unauthorized code execution may occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts the FileWriterTool component within the crewai-tools library, potentially allowing for code execution. Owners of applications or systems that utilize this tool should first identify all deployments, assess their exposure and business criticality, and then confirm the accountable team responsible for the affected library. Planning remediation should be risk-based, considering factors like integration into internet-facing systems or critical agent workflows.

  • Application owners should own the issue.
  • Verify tool reachability and criticality.
  • Plan risk-based remediation actions.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is the FileWriterTool in crewai-tools?

FileWriterTool is a component within the crewai-tools library, which provides utility functions for AI agents to interact with the file system. Developers integrate these tools into agent frameworks to enable automated tasks like logging, saving outputs, or managing local data storage during agent-driven workflows.

What does CVE-2026-37007 mean in plain English?

This vulnerability is classified as Improper Limitation of a Pathname to a Restricted Directory, or CWE-22. It means the tool fails to properly sanitize file paths provided to it. An attacker can use specific character sequences to 'climb' out of the intended folder, potentially writing files to unauthorized locations on the server, which can lead to remote code execution.

How is this vulnerability triggered?

The flaw is triggered when the tool processes a filename argument containing malicious path traversal sequences. It is important to note that the vulnerability is not triggered by standard, legitimate file operations; the application must be accepting and processing externally influenced or untrusted input that is then passed directly into the tool's filename parameter.

Do I need to worry if my system uses this library?

Your concern depends on how the tool is integrated. According to Halo Surface Signal, the library itself is a development component rather than an edge service. However, if your AI agent application is configured to accept network-based inputs and passes that data to the FileWriterTool, the risk increases significantly because the path becomes reachable from the network.

How should I respond to this threat?

Start by auditing your codebase to locate where crewai-tools is utilized. Identify every instance where the FileWriterTool is implemented and determine if the filenames it processes originate from user input or external network requests. Once mapped, prioritize updates for any workflows that handle untrusted data and confirm the specific version of the library currently running in your production environment.

References