CVE-2019-19956

HIGHNVD 7.57.5—

7.5

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

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 43.4%
KEV: Not listed

Published

December 24, 2019

Last Modified

December 3, 2025

References (24)

cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00047.html
cve@mitrehttp://lists.opensuse.org/opensuse-security-announce/2020-06/msg00005.html
cve@mitrehttps://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdf
cve@mitrehttps://gitlab.gnome.org/GNOME/libxml2/commit/5a02583c7e683896d84878bd90641d8d9b0d0549
cve@mitrehttps://lists.debian.org/debian-lts-announce/2019/12/msg00032.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R55ZR52RMBX24TQTWHCIWKJVRV6YAWI/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JDPF3AAVKUAKDYFMFKSIQSVVS3EEFPQH/
cve@mitrehttps://security.netapp.com/advisory/ntap-20200114-0002/
cve@mitrehttps://us-cert.cisa.gov/ics/advisories/icsa-21-103-08
cve@mitrehttps://usn.ubuntu.com/4274-1/
cve@mitrehttps://www.oracle.com/security-alerts/cpujul2020.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00047.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00005.html
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdf

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	python3-libxml2 (2.9.4+dfsg1-6.1ubuntu1.3) @ bionic	2026-05-27	ubuntu
redhat	openshiftdo/odo-init-image-rhel7:1.1.3-2	2021-03-22	redhat
redhat	libxml2-0:2.9.7-8.el8	2020-11-04	redhat
redhat	libxml2-0:2.9.1-6.el7.5	2020-09-29	redhat
redhat	libxml2	2020-06-22	redhat
redhat	jbcs-httpd24-openssl-pkcs11-0:0.4.10-7.jbcs.el7	2020-06-22	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 19× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-27 09:57 UTCEG score recompute
2026-05-27 09:57 UTCVendor advisory
2026-05-27 09:57 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2019-19956?

CVE-2019-19956 is a high vulnerability published on December 24, 2019. xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.

When was CVE-2019-19956 disclosed?

CVE-2019-19956 was first published in the National Vulnerability Database on December 24, 2019, with the most recent update on December 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-19956 actively exploited?

CVE-2019-19956 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 43.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-19956?

CVE-2019-19956 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2019-19956?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-19956, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-19956

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CVE-2019-19956

Published

Last Modified

References (24)

Patch Availability(6)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-19956?

Same vendor

Same CWE

CVE-2019-19956

📅 Published

🔄 Last Modified

🔗 References (24)

Patch Availability(6)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-19956?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

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Published

Last Modified

References (24)

Frequently asked(5)

Related CVEs(same vendor + same CWE)