Medium RHSA-2026:1537 1 CVE

Red Hat Security Advisory: python security update

Published Jan 29, 2026 · Updated Jun 30, 2026

Ecosystem: Red Hat

Fixed packages 8

Release	Package	Fixed in
Red Hat · RHEL 7 ELS rhel_els:7	python	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-debug	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-debuginfo	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-devel	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-libs	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-test	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	python-tools	0:2.7.5-94.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7	tkinter	0:2.7.5-94.el7_9.2

Vulnerabilities 1

Medium 6.3

CVE-2025-12084

Quadratic complexity in node ID cache clearing

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.

Python Software Foundation CPython python3.4 python3.5 Debian Ubuntu Azure Linux Wolfi

Dec 3, 2025

References

article
https://access.redhat.com/security/updates/classification/#moderate
report
https://bugzilla.redhat.com/show_bug.cgi?id=2418655
advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_1537.json
report
https://access.redhat.com/security/cve/CVE-2025-12084
advisory
https://www.cve.org/CVERecord?id=CVE-2025-12084
advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-12084
article
https://github.com/python/cpython/issues/142145
article
https://github.com/python/cpython/pull/142146