CVE-2026-76781
Libxml2: libxml2: null pointer dereference parsing nextcatalog without catalog attribute
CVSS Score
5.5
EPSS Score
0.2%
EPSS Percentile
6th
A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).
| CWE | CWE-476 |
| Vendor | red hat |
| Product | red hat hardened images |
| Published | Sep 17, 2026 |
| Last Updated | Oct 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Hardened Images
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 4
All versions affected Red Hat / Red Hat OpenShift Container Platform 5
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:57604 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-76781 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2519776 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442
Credits
Red Hat would like to thank Yirou Yang for reporting this issue.