{
    "id": "CVE-2025-56005",
    "published": "2026-01-20 19:15:49",
    "last_modified": "2026-09-17 12:17:09",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-502",
    "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.",
    "epss_score": "0.19069",
    "epss_percentile": "0.97241",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-03 18:17:53",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "EPSS 19.1% — above the 10% action threshold."
    },
    "products": [
        {
            "vendor": "dabeaz",
            "product": "ply"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "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",
        "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://access.redhat.com/security/cve/CVE-2025-56005",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2431308",
        "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-56005.json"
    ]
}