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Fencer Intel
high 7.5

CVE-2019-19956 json

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to...

published 6y ago modified 26d ago also EUVD-2019-9544 , JLSEC-2025-66

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.6%
EPSS 5.6% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.

Patch / fix

  • julia XML2_jll 2.9.10+0
  • 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 14, Debian 13, Debian 12 2.9.10+dfsg-2

debian advisories DEBIAN-CVE-2019-19956

  • libxml2 Ubuntu 16.04 LTS 2.9.3+dfsg1-1ubuntu0.7
  • libxml2 Ubuntu 18.04 LTS 2.9.4+dfsg1-6.1ubuntu1.3
  • libxml2 Ubuntu Pro 14.04 LTS 2.9.1+dfsg1-3ubuntu4.13+esm1

ubuntu advisories UBUNTU-CVE-2019-19956

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 RHEL 7 2.9.1-6.el7.5
  • libxml2-python RHEL 7 2.9.1-6.el7.5
  • libxml2 RHEL 8 2.9.7-8.el8
  • python3-libxml2 RHEL 8 2.9.7-8.el8
  • jbcs-httpd24-curl jboss core services 1 7.64.1-36.jbcs.el6
  • jbcs-httpd24-curl jboss core services 1 7.64.1-36.jbcs.el7
  • jbcs-httpd24-httpd jboss core services 1 2.4.37-57.jbcs.el6
  • jbcs-httpd24-httpd jboss core services 1 2.4.37-57.jbcs.el7

red hat advisories RHSA-2020:3996RHSA-2020:4479RHSA-2020:2644

  • libxml2 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.7.6-0.77.36.1
  • libxml2-python SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 2.7.6-0.77.36.1
  • libxml2 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 2.9.4-46.34.1
  • python-libxml2 SLES for SAP 12 SP5, SLES 12 SP5 2.9.4-46.34.1
  • libxml2 SLE Module for Basesystem 15 SP2, SLE Module for Basesystem 15 SP1 2.9.7-3.22.1
  • python-libxml2-python SLE Module for Python 2 15 SP2, SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP2 +1 more 2.9.7-3.22.1
  • libxml2 SLE Module for Basesystem 15 SP1 2.9.7-3.19.8
  • python-libxml2-python SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1 2.9.7-3.19.10

suse advisories SUSE-SU-2021:14729-1SUSE-SU-2020:2609-1SUSE-SU-2020:1532-2SUSE-SU-2020:1532-1SUSE-SU-2020:1299-1

  • libxml2 openSUSE Tumbleweed 2.9.12-1.2
  • libxml2 openSUSE Leap 15.1 2.9.7-lp151.5.12.1
  • python-libxml2-python openSUSE Leap 15.1 2.9.7-lp151.5.12.1
  • libxml2 openSUSE Leap 15.1 2.9.7-lp151.5.9.1
  • python-libxml2-python openSUSE Leap 15.1 2.9.7-lp151.5.9.1

opensuse advisories openSUSE-SU-2024:11016-1openSUSE-SU-2020:0781-1openSUSE-SU-2020:0681-1

  • libxml2 Alpine 3.10 2.9.9-r3
  • libxml2 Alpine 3.8 2.9.8-r2
  • libxml2 Alpine 3.9 2.9.9-r2

alpine advisories ALPINE-CVE-2019-19956

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

Is CVE-2019-19956 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2019-19956 updated cvss 7.5

libxml2: memory leak in xmlParseBalancedChunkMemoryRecover in parser.c

  • Red Hat Enterprise Linux 5 libxml2 Red Hat Enterprise Linux 6 libxml2, libxml2-python
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Do 1 openshiftdo/odo-init-image-rhel7 1.1.3-2
    fixed: vendor fix RHSA-2021:0949
  • Red Hat Enterprise Linux AppStream (v. 8) libxml2-devel 2.9.7-8.el8, libxml2-debuginfo 2.9.7-8.el8, libxml2-debugsource 2.9.7-8.el8, python3-libxml2-debuginfo 2.9.7-8.el8 Red Hat Enterprise Linux BaseOS (v. 8) libxml2 2.9.7-8.el8, python3-libxml2 2.9.7-8.el8
    fixed: vendor fix RHSA-2020:4479
  • Red Hat Enterprise Linux Client (v. 7) libxml2 2.9.1-6.el7.5, libxml2-python 2.9.1-6.el7.5 Red Hat Enterprise Linux Client Optional (v. 7) libxml2-devel 2.9.1-6.el7.5, libxml2-static 2.9.1-6.el7.5, libxml2-debuginfo 2.9.1-6.el7.5 Red Hat Enterprise Linux ComputeNode (v. 7) libxml2 2.9.1-6.el7.5, libxml2-python 2.9.1-6.el7.5 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libxml2-devel 2.9.1-6.el7.5, libxml2-static 2.9.1-6.el7.5, libxml2-debuginfo 2.9.1-6.el7.5 Red Hat Enterprise Linux Server (v. 7) libxml2 2.9.1-6.el7.5, libxml2-python 2.9.1-6.el7.5 Red Hat Enterprise Linux Server Optional (v. 7) libxml2-static 2.9.1-6.el7.5, libxml2-debuginfo 2.9.1-6.el7.5
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) libxml2 2.9.1-6.el7.5, libxml2-python 2.9.1-6.el7.5 Red Hat Enterprise Linux Workstation Optional (v. 7) libxml2-static 2.9.1-6.el7.5, libxml2-debuginfo 2.9.1-6.el7.5
    fixed: vendor fix RHSA-2020:3996
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2020:2646
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-curl 7.64.1-36.jbcs.el6, jbcs-httpd24-httpd 2.4.37-57.jbcs.el6, jbcs-httpd24-mod_md 2.0.8-24.jbcs.el6, jbcs-httpd24-libcurl 7.64.1-36.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.37-57.jbcs.el6, jbcs-httpd24-nghttp2 1.39.2-25.jbcs.el6, +12 more Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-curl 7.64.1-36.jbcs.el7, jbcs-httpd24-httpd 2.4.37-57.jbcs.el7, jbcs-httpd24-mod_md 2.0.8-24.jbcs.el7, jbcs-httpd24-libcurl 7.64.1-36.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.37-57.jbcs.el7, jbcs-httpd24-nghttp2 1.39.2-25.jbcs.el7, +13 more
    fixed: vendor fix RHSA-2020:2644
  • Red Hat JBoss Web Server 5 libxml2
    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 7.5

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 ICSA-21-103-08 updated cvss 7.5

Siemens SINEMA Remote Connect Server

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
yes
Technical impact
partial
Assessed
11mo ago

Exploit prediction

5.63% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/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
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
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
<2.9.10+0
2.9.10+0

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
  • CWE-772 Missing Release of Resource after Effective Lifetime
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Intel 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.