CVE-2025-12084
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Python
PublishedDec 3, 2025
First seenDec 3, 2025
Weakness typeCWE-407CWE-407
How to fix
Update
- python python3.13.11, 3.14.2 or later
Patches
- github.com/python/cpython/pull/142146
- github.com/python/cpython/commit/08d8e18ad81cd45bc4a27d6da478b51ea49486e4
- github.com/python/cpython/commit/027f21e417b26eed4505ac2db101a4352b7c51a0
- github.com/python/cpython/commit/ddcd2acd85d891a53e281c773b3093f9db953964
- github.com/python/cpython/commit/27648a1818749ef44c420afe6173af6868715437
- github.com/python/cpython/commit/8d2d7bb2e754f8649a68ce4116271a4932f76907
- github.com/python/cpython/commit/9c9dda6625a2a90d2a06c657eee021d6be19842d
- github.com/python/cpython/commit/a696ba8b4d42fd632afc9bc88ad830a2e4cceed8
- github.com/python/cpython/commit/41f468786762348960486c166833a218a0a436af
- github.com/python/cpython/commit/57937a8e5e293f0dcba5115f7b7a11b1e0c9a273
- github.com/python/cpython/commit/e91c11449cad34bac3ea55ee09ca557691d92b53
- github.com/python/cpython/commit/a46c10ec9d4050ab67b8a932e0859a2ea60c3cb8
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python python | v < 3.13.11, 3.14.0 ≤ v < 3.14.2, 3.15.0 | 3.13.11, 3.14.2 |
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