Malicious Code Execution in Picklescan via Bypassed Pickle Detection

Executive Summary

This vulnerability exists in picklescan versions before 0.0.29, where the tool fails to detect malicious pickle files that use the code.InteractiveInterpreter.runcode method within reduce methods. Attackers can craft specially designed pickle payloads that bypass picklescan's detection mechanisms and execute arbitrary code when these payloads are loaded using pickle.load().

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Detection Guidance

This vulnerability involves picklescan failing to detect malicious pickle files that use code.InteractiveInterpreter.runcode in reduce methods. Detection requires analyzing pickle files for the presence of this specific payload.

Since picklescan versions before 0.0.29 do not detect this payload, you can attempt to manually inspect pickle files or monitor for suspicious pickle.load() calls in your environment.

There are no specific commands provided in the resources to detect this vulnerability automatically.

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Impact Analysis

The vulnerability allows attackers to execute arbitrary code on systems that use vulnerable versions of picklescan to scan pickle files. This can lead to unauthorized code execution, potentially compromising the affected system's security, leading to data breaches, system manipulation, or further exploitation.

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Compliance Impact

CVE-2025-71371 allows attackers to execute arbitrary code by bypassing picklescan's detection of malicious pickle files. This can lead to unauthorized access or manipulation of sensitive data processed or stored by affected systems.

Such unauthorized code execution and potential data compromise can negatively impact compliance with data protection regulations like GDPR and HIPAA, which require strict controls to protect personal and sensitive information from unauthorized access or breaches.

Organizations relying on picklescan for security may face increased risk of data breaches or supply chain attacks, which could result in regulatory penalties or loss of trust if sensitive data is exposed or manipulated.

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Mitigation Strategies

To mitigate this vulnerability, immediately upgrade picklescan to a version later than 0.0.29 where this detection bypass is fixed.

Avoid loading pickle files from untrusted or unauthenticated sources, especially if relying on picklescan for detection.

Implement additional security controls such as restricting the use of pickle.load() or replacing pickle with safer serialization methods.

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