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libxml2 EUVDEUVD-2026-25346

| CVE-2026-6732 HIGH
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-04-23 redhat GHSA-6rf6-xrp6-223m
7.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-reachable XSD validation of untrusted XML needs no auth or interaction (AV:N/AC:L/PR:N/UI:N); impact is a crash only, so C:N/I:N/A:H.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/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

Lifecycle Timeline

7
Analysis Generated
Jul 24, 2026 - 03:16 vuln.today
Severity Changed
Jun 30, 2026 - 20:22 NVD
MEDIUM HIGH
CVSS changed
Jun 30, 2026 - 20:22 NVD
6.5 (MEDIUM) 7.5 (HIGH)
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 23, 2026 - 22:45 euvd
EUVD-2026-25346
CVE Published
Apr 23, 2026 - 22:19 nvd
MEDIUM 6.5
CVE Published
Apr 23, 2026 - 22:19 nvd
HIGH 7.5

DescriptionNVD

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.

AnalysisAI

Denial of service in libxml2 allows a remote attacker to crash any application that uses the library to XSD-validate an attacker-supplied XML document containing an internal entity reference. The flaw is a CWE-843 type confusion triggered during schema validation, affecting a wide range of Red Hat products that ship libxml2. No public exploit identified at time of analysis, and EPSS is very low (0.01%, 3rd percentile), consistent with SSVC exploitation status of 'none'.

Technical ContextAI

libxml2 is the GNOME project's C library for parsing and validating XML, embedded in countless applications, language bindings, and OS base images. The vulnerability lives in the XML Schema (XSD) validation path: when the schema validator processes a document that carries an internal entity reference, it mishandles the node type and dereferences or interprets a structure as the wrong type. This is a classic CWE-843 (Access of Resource Using Incompatible Type / type confusion) root cause, where a value of one type is operated on as if it were another, producing an invalid memory access. The Red Hat CPE set indicates the affected surface is the libxml2 component as distributed within RHEL 6 through 10, Red Hat JBoss Core Services, and OpenShift Container Platform 4 rather than a single standalone application. The upstream discussion and fix are tracked in GNOME GitLab issue 1097 and merge request 411.

RemediationAI

Patch available per vendor advisory: update the libxml2 packages via Red Hat errata RHSA-2026:11503 (https://access.redhat.com/errata/RHSA-2026:11503) using your normal dnf/yum update process, then restart or redeploy services that link libxml2 (including containers and OpenShift images, which must be rebuilt/pulled from patched base layers). Consult https://access.redhat.com/security/cve/CVE-2026-6732 for the exact fixed package versions per RHEL release, and the upstream fix in GNOME libxml2 merge request 411 (https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/411) if you build libxml2 from source. If immediate patching is not possible, the effective compensating control is to avoid XSD-validating untrusted XML: disable or bypass schema validation on paths that accept external documents, or front the service with input filtering that rejects documents containing internal entity/DTD declarations before they reach the validator. The trade-off is that disabling XSD validation removes a data-integrity check and entity filtering may break legitimate documents that rely on internal entities, so apply these controls only to externally exposed, untrusted-input paths.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed

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EUVD-2026-25346 vulnerability details – vuln.today

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