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CVE-2025-56005

9.8 · CRITICAL
Published Jan 20, 2026 dabeaz CWE-502

Overview

CVE-2025-56005 is a critical-severity vulnerability affecting dabeaz ply. It was published on January 20, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical Description

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.

Remediation

Check the references section for vendor advisories and patches from dabeaz. Update ply to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

Vendor Product Versions Status

References

GitHub github.com/bohmiiidd/Undocumented-RCE-in-PLY GitHub github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005 GitHub github.com/tom025/ply_exploit_rejection GitHub github.com/tom025/ply_exploit_rejection/issues/1 Ref www.openwall.com/lists/oss-security/2026/01/23/4 Ref www.openwall.com/lists/oss-security/2026/01/23/5 Ref www.openwall.com/lists/oss-security/2026/01/28/5 Ref www.openwall.com/lists/oss-security/2026/01/29/1 Ref www.openwall.com/lists/oss-security/2026/01/29/2 Ref www.openwall.com/lists/oss-security/2026/01/30/1

Frequently Asked Questions

What is CVE-2025-56005?

CVE-2025-56005 is a critical-severity vulnerability affecting dabeaz ply. It was published on January 20, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-56005?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-56005?

Check the references section for vendor advisories and patches from dabeaz. Update ply to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-56005?

CyberStrike's AI-powered security agents can automatically detect CVE-2025-56005 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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Code Review

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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