Home/CVE/When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_ca
CVE

CVE-2025-12084

When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_ca

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.

MEDIUM · CVSS 5.3 EPSS 0.00128
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-407Inefficient Algorithmic Complexity
▤

Affected Products & Versions

3
python< 3.13.11
python>= 3.14.0 and < 3.14.2
pythonall versions
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighPython Reverse Shell Execution Via PTY And Socket Modules
producthighInline Python Execution - Spawn Shell Via OS System Library
producthighPython One-Liners with Base64 Decoding - Linux
producthighPython Function Execution Security Warning Disabled In Excel
producthighPython One-Liners with Base64 Decoding
producthighPython Spawning Pretty TTY on Windows
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cna@python.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Dec 2025 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
suse-csafSUSE-SU-2026:1349-1
rhsaRHSA-2026:8824Moderate
rhsaRHSA-2026:8822Moderate
rhsaRHSA-2026:7443Moderate
rhsaRHSA-2026:7661Moderate
🔗

References & Sources

14
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/python/cpython/commit/027f21e417b26eed4505ac2db101a4352b7c51a0Patch
https://github.com/python/cpython/commit/08d8e18ad81cd45bc4a27d6da478b51ea49486e4Patch
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
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