xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.
Priority MEDIUM 47CWE-772Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 14 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-772.
Summary
xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.05626 92nd percentileScored 2026-11-07
Fix Partial Red Hat: 5 advisoriesRed Hat: 14 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 18
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:* | before 2.9.10 | Vulnerable | xmlsoft |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:a:oracle:real_user_experience_insight:13.3.1.0:*:*:*:*:*:*:* | 13.3.1.0 | Vulnerable | Oracle |
| cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* | 30 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:* | 12.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* | 14.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
- cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:* Versions before 2.9.10 Vulnerable ·xmlsoft
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:a:oracle:real_user_experience_insight:13.3.1.0:*:*:*:*:*:*:* Versions 13.3.1.0 Vulnerable ·Oracle
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:* Versions 12.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
Show 8 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 19.10 | Vulnerable | Canonical |
| cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* | before 3.0 | Vulnerable | Siemens |
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
- cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:clustered_data_ontap_antivirus_connector:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:manageability_software_development_kit:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:* Versions before 3.0 Vulnerable ·Siemens
Remediation
Red Hat 5 advisories
- RHSA-2021:0949 Released 2021-03-22 · Red Hat rating LowRed Hat OpenShift Do openshift/odo-init-image 1.1.3 security update
- OpenShift Do 1 openshiftdo/odo-init-image-rhel7
- RHSA-2020:4479 Released 2020-11-04 · Red Hat rating Moderatelibxml2 security update
- Red Hat Enterprise Linux AppStream (v. 8) libxml2-devel-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
- RHSA-2020:3996 Released 2020-09-29 · Red Hat rating Moderatelibxml2 security and bug fix update
- 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
- 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
- Red Hat Enterprise Linux Server (v. 7) libxml2-2.9.1-6.el7.5, libxml2-2.9.1-6.el7.5.ppc, libxml2-devel-2.9.1-6.el7.5 +2
- Red Hat Enterprise Linux Server Optional (v. 7) libxml2-static-2.9.1-6.el7.5, libxml2-static-2.9.1-6.el7.5.ppc
- Red Hat Enterprise Linux Workstation (v. 7) libxml2-2.9.1-6.el7.5, libxml2-devel-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
Show 2 more Red Hat advisories
- RHSA-2020:2646 Released 2020-06-22 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.37 SP3 security update
- Red Hat JBoss Core Services
- RHSA-2020:2644 Released 2020-06-22 · Red Hat rating ImportantRed Hat JBoss Core Services Apache HTTP Server 2.4.37 SP3 security update
- 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-httpd-devel-2.4.37-57.jbcs.el6 +18
- 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-httpd-devel-2.4.37-57.jbcs.el7 +19
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| OpenShift Do 1 | Fixed | RHSA-2021:0949 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:4479 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2020:4479 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2020:3996 |
| Red Hat JBoss Core Services | Fixed | RHSA-2020:2646 |
| Red Hat JBoss Core Services on RHEL 6 Server | Fixed | RHSA-2020:2644 |
| Red Hat JBoss Core Services on RHEL 7 Server | Fixed | RHSA-2020:2644 |
Not affected: 1 product
- Red Hat JBoss Web Server 5
Timeline
- 2026-10-02 Threatist record created from CVE-2019-19956
- 2026-10-03 Alias added: GHSA-5cvc-j2xm-h554
References
Advisory 11
- [debian-lts-announce] 20191228 [SECURITY] [DLA 2048-1] libxml2 security update
- USN-4274-1
- FEDORA-2020-0c71c00af4
- FEDORA-2020-7694e8be73
- openSUSE-SU-2020:0681
- openSUSE-SU-2020:0781
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://security.netapp.com/advisory/ntap-20200114-0002/
- [debian-lts-announce] 20200909 [SECURITY] [DLA 2369-1] libxml2 security update
- https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-08
Sources
- CVE-2019-19956 · CVE Program
- CVE-2019-19956 · NVD
- FIRST EPSS
- GHSA-5cvc-j2xm-h554 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-19956 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences