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Vulnerability record · CVE-2025-12084 · published 3 December 2025

CVE-2025-12084: Python vulnerability

Python · Python

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.

6.3 CVSS 4.0 Medium EPSS 0.86% · top 41.1% CWE-407 · CWE-407
6.3CVSS 4.0 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/python/cpython/commit/027f21e417b26eed4505ac2db101a4352b7c51a0 Patch
https://github.com/python/cpython/commit/08d8e18ad81cd45bc4a27d6da478b51ea49486e4 Patch
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 Patch
https://github.com/python/cpython/commit/e91c11449cad34bac3ea55ee09ca557691d92b53
https://github.com/python/cpython/issues/142145 Issue TrackingPatch
https://github.com/python/cpython/pull/142146 Issue TrackingPatch

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Source: NIST National Vulnerability Database (record CVE-2025-12084), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.