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cpython: python: cpython: Quadratic algorithm in xml.dom.minidom leads to denial of service

🗓️ 09 Feb 2026 08:26:57Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

CPython vulnerability: quadratic dom minidom algorithm causes denial of service when building nested documents via appendChild.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.4noarchpython-unversioned-command3.9.18-3.el9_4.10python-unversioned-command-3.9.18-3.el9_4.10.noarch.rpm
Red Hat Enterprise Linux9.4aarch64python33.9.18-3.el9_4.10python3-3.9.18-3.el9_4.10.aarch64.rpm
Red Hat Enterprise Linux9.4i686python33.9.18-3.el9_4.10python3-3.9.18-3.el9_4.10.i686.rpm
Red Hat Enterprise Linux9.4ppc64lepython33.9.18-3.el9_4.10python3-3.9.18-3.el9_4.10.ppc64le.rpm
Red Hat Enterprise Linux9.4s390xpython33.9.18-3.el9_4.10python3-3.9.18-3.el9_4.10.s390x.rpm
Red Hat Enterprise Linux9.4x86_64python33.9.18-3.el9_4.10python3-3.9.18-3.el9_4.10.x86_64.rpm
Red Hat Enterprise Linux9.4aarch64python3-debug3.9.18-3.el9_4.10python3-debug-3.9.18-3.el9_4.10.aarch64.rpm
Red Hat Enterprise Linux9.4i686python3-debug3.9.18-3.el9_4.10python3-debug-3.9.18-3.el9_4.10.i686.rpm
Red Hat Enterprise Linux9.4ppc64lepython3-debug3.9.18-3.el9_4.10python3-debug-3.9.18-3.el9_4.10.ppc64le.rpm
Red Hat Enterprise Linux9.4s390xpython3-debug3.9.18-3.el9_4.10python3-debug-3.9.18-3.el9_4.10.s390x.rpm
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29 Jun 2026 23:38Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.3
CVSS 46.3
EPSS0.00708
SSVC
CWE-770
denial of servicedom minidomappend childnested documentsclear id cache
4