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cpython: Stack overflow parsing XML with deeply nested DTD content models

🗓️ 19 May 2026 18:28:12Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 5 Views

Stack overflow in Python pyexpat parsing an inline document type with deeply nested content models causes a C stack overflow and crash.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB		CVE-2026-4224
16 Mar 202617:52
–attackerkb
Tenable Nessus		Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1583)
13 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.13, python3.13-devel, python3.13-freethreading (ALAS2023-2026-1600)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.14, python3.14-devel, python3.14-freethreading (ALAS2023-2026-1617)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.12, python3.12-devel, python3.12-idle (ALAS2023-2026-1619)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2023 : python3.11, python3.11-devel, python3.11-idle (ALAS2023-2026-1620)
30 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : python3, --advisory ALAS2-2026-3217 (ALAS-2026-3217)
1 Apr 202600:00
–nessus
Tenable Nessus		Amazon Linux 2 : python, --advisory ALAS2-2026-3218 (ALAS-2026-3218)
1 Apr 202600:00
–nessus
Tenable Nessus		AlmaLinux 8 : python3.12 (ALSA-2026:10950)
29 Apr 202600:00
–nessus
Tenable Nessus		Debian dla-4583 : idle-python3.9 - security update
15 May 202600:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64python3.120:3.12.13-2.el9_8python3.12-0:3.12.13-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64lepython3.120:3.12.13-2.el9_8python3.12-0:3.12.13-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xpython3.120:3.12.13-2.el9_8python3.12-0:3.12.13-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64python3.120:3.12.13-2.el9_8python3.12-0:3.12.13-2.el9_8.x86_64.rpm
Red Hat Enterprise Linux9anypython3.120:3.12.13-2.el9_8.i686python3.12-0:3.12.13-2.el9_8.i686.noarch.rpm
Red Hat Enterprise Linux9aarch64python3.12-debug0:3.12.13-2.el9_8python3.12-debug-0:3.12.13-2.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64lepython3.12-debug0:3.12.13-2.el9_8python3.12-debug-0:3.12.13-2.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xpython3.12-debug0:3.12.13-2.el9_8python3.12-debug-0:3.12.13-2.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64python3.12-debug0:3.12.13-2.el9_8python3.12-debug-0:3.12.13-2.el9_8.x86_64.rpm
Red Hat Enterprise Linux9anypython3.12-debug0:3.12.13-2.el9_8.i686python3.12-debug-0:3.12.13-2.el9_8.i686.noarch.rpm
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02 Jun 2026 15:25Current
7.2High risk
Vulners AI Score7.2
CVSS 46
EPSS0.0005
SSVC
CWE-805
pythonpyexpatinline document typedeeply nestedcontent modelsstack overflowprogram crashunix
5