Executive Summary

CVE-2026-25481 is a critical remote code execution vulnerability in the langroid framework, specifically affecting versions up to 0.59.31 in the TableChatAgent component.

The vulnerability arises because the Web Application Firewall (WAF) designed to block code injection in the pandas_eval tool can be bypassed. This is due to the _literal_ok() function returning false instead of raising an error on invalid input, combined with unrestricted access to dangerous Python special (dunder) attributes like __init__, __globals__, and __builtins__.

Attackers can chain whitelisted pandas DataFrame methods to leak the eval builtin function and execute arbitrary code remotely. For example, by injecting a malicious payload as a DataFrame column name, they can execute shell commands on the server hosting the vulnerable langroid instance.

This issue was patched in version 0.59.32.

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Impact Analysis

This vulnerability allows remote attackers to execute arbitrary shell commands on the server running the vulnerable langroid instance without any privileges or user interaction.

Such arbitrary code execution can lead to full system compromise, including unauthorized access to sensitive data, modification or deletion of data, disruption of services, and potential lateral movement within the network.

Because the attack vector is network-based and requires low complexity, it poses a severe security risk to any system using affected versions of langroid.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for suspicious use of the pandas_eval tool within the TableChatAgent component of langroid, especially payloads that attempt to access Python dunder attributes such as __init__, __globals__, and __builtins__ to execute arbitrary code.'}, {'type': 'paragraph', 'content': "A practical detection method involves inspecting logs or runtime behavior for DataFrame operations that chain methods like add_prefix, transpose (T), and groupby with eval accessed through the DataFrame's __init__.__globals__['__builtins__']['eval'] path."}, {'type': 'paragraph', 'content': 'For example, you can search for suspicious payload patterns in logs or input data using commands like:'}, {'type': 'list_item', 'content': 'grep -r "__init__.__globals__" /path/to/langroid/logs'}, {'type': 'list_item', 'content': 'grep -r "__builtins__" /path/to/langroid/logs'}, {'type': 'list_item', 'content': 'grep -r "pandas_eval" /path/to/langroid/logs'}, {'type': 'paragraph', 'content': 'Additionally, monitoring for unexpected shell command executions or unusual system calls originating from the langroid process may help detect exploitation attempts.'}] [1]

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Mitigation Strategies

The immediate and most effective mitigation is to upgrade langroid to version 0.59.32 or later, where the vulnerability has been patched.

The patch strengthens the sanitization logic by blocking access to dangerous dunder attributes and private attributes during AST traversal, raising an UnsafeCommandError on invalid input to prevent code injection.

If upgrading immediately is not possible, consider implementing additional input validation or restricting access to the pandas_eval tool and the TableChatAgent component to trusted users only.

Monitoring and alerting on suspicious DataFrame method chains or eval usage as described in detection can also help mitigate risk until the patch is applied.

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