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CVE-2026-4224 Details

Description

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://www.openwall.com/lists/oss-security/2026/03/16/4	CVE	Mailing ListThird Party Advisory
https://github.com/python/cpython/commit/196edfb06a7458377d4d0f4b3cd41724c1f3bd4a	[email protected]	Patch
https://github.com/python/cpython/commit/24ce88b285f56ee11626cf5e472af3cd8cc7c621	[email protected]
https://github.com/python/cpython/commit/642865ddf4b232da1f3b1f7abcfa3254c4bfe785	[email protected]	Patch
https://github.com/python/cpython/commit/af856a7177326ac25d9f66cc6dd28b554d914fee	[email protected]	Patch
https://github.com/python/cpython/commit/e0a8a6da90597a924b300debe045cdb4628ee1f3	[email protected]	Patch
https://github.com/python/cpython/commit/eb0e8be3a7e11b87d198a2c3af1ed0eccf532768	[email protected]	Patch
https://github.com/python/cpython/issues/145986	[email protected]	Issue Tracking
https://github.com/python/cpython/pull/145987	[email protected]	Patch
https://mail.python.org/archives/list/[email protected]/thread/5M7CGUW3XBRY7II4DK43KF7NQQ3TPZ6R/	[email protected]	Third Party Advisory

see all 10 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-674	Uncontrolled Recursion	CISA-ADP

Affected Products

Product	Versions
python python	< 3.10.0 >= 3.13.0, < 3.13.13 >= 3.14.0, < 3.14.4 3.15.0 alpha1 3.15.0 alpha2
CPE 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:::::: cpe:2.3:a:python:python:3.15.0:alpha3:::::: cpe:2.3:a:python:python:3.15.0:alpha4:::::: cpe:2.3:a:python:python:3.15.0:alpha5:::::: cpe:2.3:a:python:python:3.15.0:alpha6:::::: cpe:2.3:a:python:python:3.15.0:alpha7:::::: Remediation No remediation found in references.

Product

Versions

python python

< 3.10.0

>= 3.13.0, < 3.13.13

>= 3.14.0, < 3.14.4

3.15.0 alpha1

3.15.0 alpha2

CPE

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:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*

Remediation

No remediation found in references.

Change History

9 change records found show changes

Date	Action	Recorded By
Aug 13, 2026	CVE Modified	[email protected]
Aug 5, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jun 4, 2026	Initial Analysis	[email protected]
Apr 8, 2026	CVE Modified	[email protected]
Mar 17, 2026	CVE Modified	CVE
Mar 16, 2026	CVE Modified	CISA-ADP
Mar 16, 2026	New CVE Received	[email protected]