Is CVE-2019-19956 in the CISA KEV catalog?

No. CVE-2019-19956 is not currently on the CISA Known Exploited Vulnerabilities list.

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

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

What is the EPSS score for CVE-2019-19956?

CVE-2019-19956 has an EPSS score of 5.51% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2019-19956?

Upgrade libxml2 on debian 11 to 2.9.10+dfsg-2 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2019-19956

HIGHEPSS 92th pctl

7.5

CVSS v3

NVD

Description

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

CWE-401Missing Release of Memory (Memory Leak)CWE-772

How to fix

Remediation Available

libxml2Debian

Fixed in:2.9.10+dfsg-2CVE-2019-19956

libxml2Ubuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm1USN-4274-1

Fixed in:2.9.3+dfsg1-1ubuntu0.7USN-4274-1

Fixed in:2.9.4+dfsg1-6.1ubuntu1.3USN-4274-1

libxml2-utilsUbuntu

Fixed in:2.9.1+dfsg1-3ubuntu4.13+esm1USN-4274-1

Fixed in:2.9.3+dfsg1-1ubuntu0.7USN-4274-1

Fixed in:2.9.4+dfsg1-6.1ubuntu1.3USN-4274-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

5.51%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch1

gitlab.gnome.org

Third-Party Advisory7

Other references4

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-03.