Medium severity · published Sep 17, 2026
CVE-2026-76781
Libxml2: libxml2: null pointer dereference parsing nextcatalog without catalog attribute
5.5
CVSS
0.2%
EPSS
No
On KEV
Description
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).
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-76781
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-76781
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
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