Skip to content
Fencer Vulns
medium 6.5

CVE-2023-45322 json

libxml2 through 2.11.5 has a use-after-free that can only occur after a certain memory allocation...

published 2023-10-06 3 y ago modified 2026-10-15 25 d ago also EUVD-2023-49616 , JLSEC-2025-82

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits
0
none known

Summary

libxml2 through 2.11.5 has a use-after-free that can only occur after a certain memory allocation fails. This occurs in xmlUnlinkNode in tree.c. NOTE: the vendor's position is "I don't think these issues are critical enough to warrant a CVE ID ... because an attacker typically can't control when memory allocations fail."

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • libxml2 Debian 12 2.9.14+dfsg-1.3~deb12u2
  • libxml2 Debian 14, Debian 13 2.12.7+dfsg+really2.9.14-1

debian advisories DEBIAN-CVE-2023-45322

  • libxml2 SLE Module for Basesystem 15 SP4, SLE Micro 5.4, SLE Micro 5.3 +3 more 2.9.14-150400.5.25.1
  • libxml2-python SLE Module for Python 3 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.4 +4 more 2.9.14-150400.5.25.1
  • libxml2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.9.4-46.68.2
  • python-libxml2 SLES for SAP 12 SP5, SLES 12 SP5 2.9.4-46.68.2
  • libxml2 SLE Module for Basesystem 15 SP5, SLE Micro 5.5, openSUSE Leap 15.5 2.10.3-150500.5.11.1
  • libxml2-python SLE Module for Python 3 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 2.10.3-150500.5.11.1
  • libxml2 SLE Micro 5.2, SLE Micro 5.1 2.9.7-150000.3.63.1
  • python-libxml2-python SLE Micro 5.2, openSUSE Leap 15.5, openSUSE Leap 15.4 2.9.7-150000.3.63.1

suse advisories SUSE-SU-2023:4537-1SUSE-SU-2023:4505-1SUSE-SU-2023:4504-1SUSE-SU-2023:4464-1

  • libxml2 openSUSE Tumbleweed 2.11.5-2.1

opensuse advisories openSUSE-SU-2024:13426-1

  • libxml2 CBL-Mariner 2.0 2.10.4-2
  • libxml2 Azure Linux 3.0 2.11.5-3

azure linux advisories AZL-31272AZL-34960

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2023-45322 updated cvss 5.9

libxml2: use-after-free in xmlUnlinkNode() in tree.c

  • Red Hat Enterprise Linux 6 libxml2, libxml2-python
    affected: no fix planned “Out of support scope”
  • 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 JBoss Core Services libxml2
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    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-23-348-10 updated cvss 6.5

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

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
2 y ago

Exploit prediction

0.97% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness

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.