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Fencer Vulns
medium 6.5

CVE-2026-6732 json

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

published 2026-04-23 6 mo ago modified 2026-11-05 3 d ago also EUVD-2026-25346 , JLSEC-2026-1241

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia XML2_jll 2.15.3+0
  • Red Hat Red Hat Hardened Images 2.15.3-0.1.hum1
  • libxml2 Debian 14 2.15.3+dfsg-1

debian advisories DEBIAN-CVE-2026-6732

  • libxml2 Ubuntu 25.10 2.14.5+dfsg-0.2ubuntu0.2
  • libxml2 Ubuntu 26.04 LTS 2.15.2+dfsg-0.1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-6732

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libxml2 hummingbird 1 2.15.3-0.1.hum1
  • libxml2-16 hummingbird 1 2.15.3-0.1.hum1
  • python3-libxml2 hummingbird 1 2.15.3-0.1.hum1

red hat advisories RHSA-2026:11503

  • libxml2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.13.8-160000.5.1
  • libxml2-python SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.13.8-160000.5.1

suse advisories SUSE-SU-2026:22596-1SUSE-SU-2026:22636-1

  • libxml2 openSUSE Leap 16.0 2.13.8-160000.5.1
  • libxml2-python openSUSE Leap 16.0 2.13.8-160000.5.1

opensuse advisories openSUSE-SU-2026:21317-1

  • libxml2 Alpine 3.23, Alpine 3.22, Alpine 3.21 2.13.9-r1
  • libxml2 Alpine 3.24 2.13.9-r2
  • openjdk21 Alpine 3.24, Alpine 3.23 21.0.13.0.3_p1-r0
  • openjdk25 Alpine 3.24, Alpine 3.23 25.0.5.0.3_p1-r0
  • qt6-qtwebengine Alpine 3.23 6.10.3-r3
  • qt6-qtwebengine Alpine 3.24 6.11.0-r9

alpine advisories ALPINE-CVE-2026-6732

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6732 updated cvss 6.5

libxml2: libxml2: Denial of Service via crafted XSD-validated document

  • Red Hat JBoss Core Services libxml2
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images libxml2 2.15.3-0.1.hum1, libxml2-16 2.15.3-0.1.hum1, python3-libxml2 2.15.3-0.1.hum1
    fixed: vendor fix RHSA-2026:11503
  • Red Hat Enterprise Linux 6 libxml2, libxml2-python Red Hat Enterprise Linux 7 libxml2, libxml2-python Red Hat Enterprise Linux 8 libxml2, python3-libxml2 Red Hat Enterprise Linux 9 libxml2, python3-libxml2 Red Hat Enterprise Linux 10 libxml2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-293-05 updated cvss 7.5

Hitachi Energy RTU500 Product

  • Hitachi Energy RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=13.5.1, <=13.5.4, vers:RTU500_series_CMU_Firmware/>=13.6.1, <=13.6.3, vers:RTU500_series_CMU_Firmware/>=13.7.1, <=13.7.8, vers:RTU500_series_CMU_Firmware/>=13.8.1, <=13.8.2
    affected: vendor fix, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/libxml2/-/issues/1097 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia XML2_jll
>=2.13.1+0, <2.15.3+0
2.15.3+0

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat JBoss Core Services
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.