Libxml2: libxml2: denial of service via crafted xsd-validated document

CVE	CVE-2026-6732
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-04-23 23:16:16 UTC
Updated	2026-05-15 14:36:35 UTC
Description	A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could exploit this by providing a malicious document, leading to a type confusion error that causes the application to crash. This results in a denial of service (DoS), making the affected system or application unavailable.

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000860000 probability, percentile 0.246270000 (date 2026-05-25)

Problem Types: CWE-843 | CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	6.5	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	CVSS	6.5	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Type	Vendor	Product	Version	Update	Edition	Language
Operating System	Redhat	Enterprise Linux	10.0	All	All	All
Operating System	Redhat	Enterprise Linux	6.0	All	All	All
Operating System	Redhat	Enterprise Linux	7.0	All	All	All
Operating System	Redhat	Enterprise Linux	8.0	All	All	All
Operating System	Redhat	Enterprise Linux	9.0	All	All	All
Application	Redhat	Hardened Images	-	All	All	All
Application	Redhat	Jboss Core Services	-	All	All	All
Application	Redhat	Openshift Container Platform	4.0	All	All	All
Application	Xmlsoft	Libxml2	All	All	All	All

Source	Vendor	Product	Version	Platforms
CNA	Red Hat	Red Hat Hardened Images	unaffected 2.15.3-0.1.hum1 * rpm	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 10	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 7	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	Not specified	Not specified
CNA	Red Hat	Red Hat JBoss Core Services	Not specified	Not specified
CNA	Red Hat	Red Hat OpenShift Container Platform 4	Not specified	Not specified

Reference	Source	Link	Tags
gitlab.gnome.org/GNOME/libxml2/-/merge_requests/411	[email protected]	gitlab.gnome.org	Issue Tracking, Third Party Advisory
access.redhat.com/security/cve/CVE-2026-6732	[email protected]	access.redhat.com	Third Party Advisory
access.redhat.com/errata/RHSA-2026:11503	[email protected]	access.redhat.com	Third Party Advisory
gitlab.gnome.org/GNOME/libxml2/-/issues/1097	[email protected]	gitlab.gnome.org	Exploit, Issue Tracking, Third Party Advisory
bugzilla.redhat.com/show_bug.cgi	[email protected]	bugzilla.redhat.com	Issue Tracking, Third Party Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

CNA: Red Hat would like to thank Ariel Schon for reporting this issue. (en)

Source	Time	Event
CNA	2026-04-23T22:04:33.973Z	Reported to Red Hat.
CNA	2026-04-16T00:00:00.000Z	Made public.

There are currently no legacy QID mappings associated with this CVE.