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    CVE-2025-12084

    When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_cache() the algorithm is quadratic. Availability can be impacted when building excessively nested documents.

    Published:Dec 3, 2025
    Last Modified:Mar 3, 2026
    EPS:Dec 3, 2025
    EPSS Score:0.00049
    CVSS Score:5.3

    Affected Products

    Vendor
    Python
    Product
    Cpython
    Vendor
    Python
    Product
    Python

    Exploits

    No exploit reference

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    References

    https://github.com/python/cpython/commit/027f21e417b26eed4505ac2db101a4352b7c51a0
    https://github.com/python/cpython/commit/08d8e18ad81cd45bc4a27d6da478b51ea49486e4
    https://github.com/python/cpython/commit/27648a1818749ef44c420afe6173af6868715437
    https://github.com/python/cpython/commit/41f468786762348960486c166833a218a0a436af
    https://github.com/python/cpython/commit/57937a8e5e293f0dcba5115f7b7a11b1e0c9a273
    https://github.com/python/cpython/commit/8d2d7bb2e754f8649a68ce4116271a4932f76907
    https://github.com/python/cpython/commit/9c9dda6625a2a90d2a06c657eee021d6be19842d
    https://github.com/python/cpython/commit/a46c10ec9d4050ab67b8a932e0859a2ea60c3cb8
    https://github.com/python/cpython/commit/a696ba8b4d42fd632afc9bc88ad830a2e4cceed8
    https://github.com/python/cpython/commit/c97e87593063d84a2bd9fe7068b30eb44de23dc0
    https://github.com/python/cpython/commit/ddcd2acd85d891a53e281c773b3093f9db953964
    https://github.com/python/cpython/commit/e91c11449cad34bac3ea55ee09ca557691d92b53
    https://github.com/python/cpython/issues/142145
    https://github.com/python/cpython/pull/142146

    Common Vulnerability Scoring System

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