CVE intelligence

CVE-2025-12084

Vulnerability intelligence

Published Dec 3, 2025Sources checked Oct 26, 2026

5.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2025-12084 and is rated Medium severity with a CVSS score of 5.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Oct 21, 2026

CBL-Mariner Releases Release Notes

Vendor-listed releases

3.12.9-7
3.9.19-19

CISA KEVNot listedBased on the latest collected catalog

EPSS0.8%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is 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.

Source: NVD