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CVE-2019-19956· NVD / CVE Program· CNA mitre

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

Noroxi assessment

Priority: Monitor (action score 32/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 5.5% (FIRST EPSS); higher than 92.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: libxml2 (Alpine:v3.10) 2.9.9-r3; libxml2 (Alpine:v3.8) 2.9.8-r2; libxml2 (Alpine:v3.9) 2.9.9-r2.
  • Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to libxml2 (Alpine:v3.10) 2.9.9-r3; libxml2 (Alpine:v3.8) 2.9.8-r2; libxml2 (Alpine:v3.9) 2.9.9-r2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 24, 2019
Updated
Jun 16, 2026
EPSS
5.6% · 93th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 5.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-19956

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
xmlsoftlibxml2
debiandebian linux
oraclereal user experience insight
fedoraprojectfedora
canonicalubuntu linux
netappactive iq unified manager
netappclustered data ontap
netappclustered data ontap antivirus connector
netappmanageability software development kit
netappontap select deploy administration utility
netappsteelstore cloud integrated storage
siemenssinema remote connect server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux19.10
  • debian debian linux8.0
  • debian debian linux9.0
  • fedoraproject fedora30
  • fedoraproject fedora32
  • netapp active iq unified managerall versions
  • netapp clustered data ontapall versions
  • netapp clustered data ontap antivirus connectorall versions
  • netapp manageability software development kitall versions
  • netapp ontap select deploy administration utilityall versions
  • netapp steelstore cloud integrated storageall versions
  • oracle real user experience insight13.3.1.0
  • siemens sinema remote connect serverbefore 3.0
  • xmlsoft libxml2before 2.9.10

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.10libxml2before 2.9.9-r32.9.9-r3
Alpine:v3.8libxml2before 2.9.8-r22.9.8-r2
Alpine:v3.9libxml2before 2.9.9-r22.9.9-r2
Debian:12libxml2before 2.9.10+dfsg-22.9.10+dfsg-2
Debian:8libxml2before 2.9.1+dfsg1-5+deb8u82.9.1+dfsg1-5+deb8u8
Debian:9libxml2before 2.9.4+dfsg1-2.2+deb9u32.9.4+dfsg1-2.2+deb9u3
openSUSE:Leap 15.1libxml2before 2.9.7-lp151.5.12.12.9.7-lp151.5.12.1
openSUSE:Leap 15.1libxml2before 2.9.7-lp151.5.9.12.9.7-lp151.5.9.1
openSUSE:Leap 15.1python-libxml2-pythonbefore 2.9.7-lp151.5.9.12.9.7-lp151.5.9.1
openSUSE:Leap 15.1python-libxml2-pythonbefore 2.9.7-lp151.5.12.12.9.7-lp151.5.12.1
openSUSE:Tumbleweedlibxml2before 2.9.12-1.22.9.12-1.2
Red Hat:enterprise_linux:7::clientlibxml2before 0:2.9.1-6.el7.50:2.9.1-6.el7.5
Red Hat:enterprise_linux:7::clientlibxml2-debuginfobefore 0:2.9.1-6.el7.50:2.9.1-6.el7.5
Red Hat:enterprise_linux:7::clientlibxml2-develbefore 0:2.9.1-6.el7.50:2.9.1-6.el7.5
Red Hat:enterprise_linux:7::clientlibxml2-pythonbefore 0:2.9.1-6.el7.50:2.9.1-6.el7.5
Red Hat:enterprise_linux:7::clientlibxml2-staticbefore 0:2.9.1-6.el7.50:2.9.1-6.el7.5
Red Hat:enterprise_linux:8::appstreamlibxml2-debuginfobefore 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:enterprise_linux:8::appstreamlibxml2-debugsourcebefore 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:enterprise_linux:8::appstreamlibxml2-develbefore 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:enterprise_linux:8::appstreampython3-libxml2-debuginfobefore 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:enterprise_linux:8::baseoslibxml2before 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:enterprise_linux:8::baseospython3-libxml2before 0:2.9.7-8.el80:2.9.7-8.el8
Red Hat:jboss_core_services:1::el6jbcs-httpd24-curlbefore 0:7.64.1-36.jbcs.el60:7.64.1-36.jbcs.el6
Red Hat:jboss_core_services:1::el6jbcs-httpd24-curl-debuginfobefore 0:7.64.1-36.jbcs.el60:7.64.1-36.jbcs.el6

+66

Same product

xmlsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2008-3529Heap-based buffer overflow in the xmlParseAttValueComplex function in parser.c in libxml2 before 2.7.0 allows context-dependent attackers to
    47Plan
  • CVE-2017-7376Buffer overflow in libxml2 allows remote attackers to execute arbitrary code by leveraging an incorrect limit for port values when handling
    46Plan
  • CVE-2022-40303An issue was discovered in libxml2 before 2.10.3.
    42Plan
  • CVE-2021-3518There's a flaw in libxml2 in versions before 2.9.11.
    42Plan
  • CVE-2011-1944Integer overflow in xpath.c in libxml2 2.6.x through 2.6.32 and 2.7.x through 2.7.8, and libxml 1.8.16 and earlier, allows context-dependent
    41Plan
  • CVE-2017-7375A flaw in libxml2 allows remote XML entity inclusion with default parser flags (i.e., when the caller did not request entity substitution, D
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:libxml22.9.9-r3 · Alpine:v3.10Package registry (OSV)
debian:libxml22.9.10+dfsg-2 · Debian:12Package registry (OSV)
opensuse:libxml22.9.7-lp151.5.9.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:python-libxml2-python2.9.7-lp151.5.9.1 · openSUSE:Leap 15.1Package registry (OSV)
red hat:jbcs-httpd24-curl0:7.64.1-36.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-curl-debuginfo0:7.64.1-36.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-manual0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-selinux0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-httpd-tools0:2.4.37-57.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-libcurl0:7.64.1-36.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-libcurl-devel0:7.64.1-36.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-mod_cluster-native0:1.3.14-4.Final_redhat_2.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
red hat:jbcs-httpd24-mod_cluster-native-debuginfo0:1.3.14-4.Final_redhat_2.jbcs.el6 · Red Hat:jboss_core_services:1::el6Package registry (OSV)
suse:libxml22.9.7-3.19.8 · SUSE:Linux Enterprise Module for Basesystem 15 SP1Package registry (OSV)
suse:libxml2-python2.7.6-0.77.36.1 · SUSE:Linux Enterprise Point of Sale 11 SP3Package registry (OSV)
suse:python-libxml22.9.4-46.34.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:python-libxml2-python2.9.7-3.19.10 · SUSE:Linux Enterprise Module for Basesystem 15 SP1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (11 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records