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    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.

    Published:Jan 20, 2026
    Last Modified:Feb 6, 2026
    EPS:Jan 20, 2026
    EPSS Score:0.01017
    CVSS Score:9.8

    Affected Products

    Vendor
    Dabeaz
    Product
    Ply
    Vendor
    Python
    Product
    Ply

    Exploits

    https://github.com/bohmiiidd/Undocumented-RCE-in-PLYhttps://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005https://github.com/tom025/ply_exploit_rejectionhttp://www.openwall.com/lists/oss-security/2026/01/23/4http://www.openwall.com/lists/oss-security/2026/01/28/5http://www.openwall.com/lists/oss-security/2026/01/29/1https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005https://github.com/tom025/ply_exploit_rejection

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-586 Object Injection

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High