CVE-2025-56005

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.

The following products are affected by CVE-2025-56005 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-56005.

URL	Resource
http://www.openwall.com/lists/oss-security/2026/01/23/4
http://www.openwall.com/lists/oss-security/2026/01/23/5
http://www.openwall.com/lists/oss-security/2026/01/28/5
http://www.openwall.com/lists/oss-security/2026/01/29/1
http://www.openwall.com/lists/oss-security/2026/01/29/2
http://www.openwall.com/lists/oss-security/2026/01/30/1
https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005
https://github.com/tom025/ply_exploit_rejection
https://github.com/tom025/ply_exploit_rejection/issues/1
https://nvd.nist.gov/vuln/detail/CVE-2025-56005
https://www.cve.org/CVERecord?id=CVE-2025-56005