Bug 2448181 (CVE-2026-4224)

Summary:	CVE-2026-4224 cpython: Stack overflow parsing XML with deeply nested DTD content models
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bbrownin, dfreiber, drow, jburrell, ljawale, luizcosta, nweather, rbobbitt, teagle, vkumar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A stack overflow flaw has been discovered in the python pyexpat module. 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. This will result in a program crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2448203, 2448209, 2448210, 2448201, 2448202, 2448204, 2448205, 2448206, 2448207, 2448208
Bug Blocks:

Description OSIDB Bzimport 2026-03-16 19:02:18 UTC

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.

Comment 5 errata-xmlrpc 2026-04-27 14:54:28 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:10950 https://access.redhat.com/errata/RHSA-2026:10950

Comment 6 errata-xmlrpc 2026-05-19 13:02:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19019 https://access.redhat.com/errata/RHSA-2026:19019

Comment 7 errata-xmlrpc 2026-05-19 13:07:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19064 https://access.redhat.com/errata/RHSA-2026:19064

Comment 8 errata-xmlrpc 2026-05-19 17:59:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19176 https://access.redhat.com/errata/RHSA-2026:19176

Comment 9 errata-xmlrpc 2026-05-19 17:59:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19177 https://access.redhat.com/errata/RHSA-2026:19177