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CVE-2025-12084

Good to know:

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Date: December 3, 2025

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.

Severity Score

Related Resources (7)

https://github.com/python/cpython/commit/08d8e18ad81cd45bc4a27d6da478b51ea49486e4
https://github.com/python/cpython/commit/027f21e417b26eed4505ac2db101a4352b7c51a0
https://github.com/python/cpython/commit/ddcd2acd85d891a53e281c773b3093f9db953964
https://nvd.nist.gov/vuln/detail/CVE-2025-12084
https://github.com/python/cpython/issues/142145
https://github.com/python/cpython/pull/142146
https://www.mend.io/vulnerability-database/CVE-2025-12084

Severity Score

Weakness Type (CWE)

Inefficient Algorithmic Complexity

CWE-407

Top Fix

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Upgrade Version

Upgrade to version cpython - 3.13.10;cpython - 3.14.1;https://github.com/python/cpython.git - v3.13.10;https://github.com/python/cpython.git - v3.14.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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