CVE-2025-56005 An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| n/a | Versions not published | |
| Migration Toolkit for Containers | Versions not published | |
| Migration Toolkit for Virtualization | Versions not published | |
| OpenShift Developer Tools and Services | Versions not published | |
| OpenShift Pipelines | Versions not published | |
| Red Hat Advanced Cluster Security 4 | Versions not published | |
| Red Hat Ceph Storage 7 | Versions not published | |
| Red Hat Ceph Storage 8 | Versions not published | |
| Red Hat Certification Program for Red Hat Enterprise Linux 9 | Versions not published |