Bug 2528986 (CVE-2026-86138)

Summary:	CVE-2026-86138 libxml2: libxml2: Arbitrary code execution via heap-based buffer overflow
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:	akhatavk, aos-team-art-private, asdas, dpaolell, gbenhaim, gtanzill, jbuscemi, jdelft, jupierce, kaycoth, kshier, lgarciaa, mbiarnes, niyer, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, stcannon, suppawar, teagle, twaugh, vlaad, watson-tool-maintainers, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in libxml2, a software library for parsing XML documents. An integer overflow within the `xmlDictAddQString` function can lead to a heap-based buffer overflow. This vulnerability could allow a local attacker to execute arbitrary code on the system, potentially compromising its integrity and confidentiality.	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:	2530724, 2530725, 2530726, 2530728, 2530729, 2530730, 2530731
Bug Blocks:

Description OSIDB Bzimport 2026-09-05 04:31:23 UTC

In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.

Comment 3 Jon Orris 2026-09-24 12:54:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:71586 https://access.redhat.com/errata/RHSA-2026:71586

Comment 4 Jon Orris 2026-09-24 16:02:54 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:71641 https://access.redhat.com/errata/RHSA-2026:71641

Comment 5 Jon Orris 2026-09-24 19:00:31 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:71585 https://access.redhat.com/errata/RHSA-2026:71585