How severe is CVE-2025-12084?

CVE-2025-12084 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-12084 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-12084?

CVE-2025-12084 primarily affects Python. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-12084?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-12084 have an EU (EUVD) identifier?

Yes. CVE-2025-12084 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201088.

When was CVE-2025-12084 published?

CVE-2025-12084 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-12084

CVE-2025-12084 is a medium-severity vulnerability in Python with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-407.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.3
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201088
Weakness: CWE-407
Affected product: Python
Published: 2025-12-03
Last modified: 2026-06-17

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.

Frequently asked questions

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.
How severe is CVE-2025-12084?: CVE-2025-12084 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-12084 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-12084?: CVE-2025-12084 primarily affects Python. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-12084?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-12084 have an EU (EUVD) identifier?: Yes. CVE-2025-12084 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201088.
When was CVE-2025-12084 published?: CVE-2025-12084 was published on 2025-12-03 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

49.229.102.187 (ipv4-addr)
203.192.232.180 (ipv4-addr)
177.53.215.134 (ipv4-addr)
172.110.223.179 (ipv4-addr)
5.99.196.202 (ipv4-addr)
137.184.228.138 (ipv4-addr)
41.63.62.103 (ipv4-addr)
149.86.233.213 (ipv4-addr)