Path Traversal in Langroid File Tools

Executive Summary

CVE-2026-50181 is a path traversal vulnerability in the Langroid framework's file tools, specifically the ReadFileTool and WriteFileTool. These tools were designed to restrict file operations to a configured directory (curr_dir) by changing the process working directory to curr_dir. However, they did not properly validate or resolve user-supplied file paths to ensure they remained within curr_dir.

Because of this, an attacker could supply path traversal sequences like "../secret.txt" to read or write files outside the intended directory boundary. This means files outside the project or workspace directory could be accessed or modified, bypassing the intended security restrictions.

The issue was fixed by introducing a safe path resolution function that validates and enforces that file paths stay within the allowed directory, blocking attempts to escape via parent directory references, absolute paths, or symlinks.

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Impact Analysis

This vulnerability can allow unauthorized reading or writing of files outside the intended project or workspace directory. An attacker or malicious agent could access sensitive files or modify critical files on the system by exploiting the path traversal flaw.

Applications that expose Langroid's file tools to large language model agents, user-controlled tool calls, or delegated coding/documentation agents are particularly at risk if they rely on curr_dir to restrict file access.

The impact includes potential exposure of confidential information and unauthorized modification of files, which can compromise the confidentiality and integrity of the system.

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Detection Guidance

This vulnerability can be detected by testing whether the Langroid file tools (ReadFileTool, WriteFileTool, ListDirTool) improperly allow path traversal sequences such as "../" to access files outside the intended directory.

One approach is to attempt to read or write files using these tools with paths that include parent directory references or absolute paths and observe if the operations succeed outside the configured current directory.

Since the vulnerability involves path traversal, commands or test scripts can be constructed to invoke these tools with payloads like "../secret.txt" or absolute paths to check if unauthorized file access is possible.

Specifically, you can run tests that try to read or write files outside the workspace directory using the vulnerable tools and verify if such operations are blocked or allowed.

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Mitigation Strategies

The immediate mitigation step is to upgrade Langroid to version 0.64.0 or later, where the vulnerability has been patched.

The patch introduces a safe path resolution function that validates and enforces that file operations remain within the configured directory, blocking path traversal attempts.

If upgrading is not immediately possible, ensure that any exposure of Langroid's file tools to untrusted users, LLM agents, or delegated code/documentation agents is restricted or disabled to prevent exploitation.

Additionally, review and implement path validation logic similar to the safe_resolve_path() function to prevent file operations outside the intended directory.

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Compliance Impact

This vulnerability allows unauthorized reading and writing of files outside the intended directory, potentially exposing sensitive data or modifying critical files.

Such unauthorized access and modification can lead to violations of data protection regulations and standards like GDPR and HIPAA, which require strict controls over access to sensitive information.

Applications relying on Langroid's file tools to enforce directory boundaries may fail to adequately protect sensitive data, thereby impacting compliance with these regulations.

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