VDB-147703 · CVE-2019-19956 · USN-4274-1

libxml2 up to 2.9.9 parser.c xmlParseBalancedChunkMemoryRecover release of resource

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in libxml2 up to 2.9.9 and classified as problematic. The affected element is the function xmlParseBalancedChunkMemoryRecover of the file parser.c. This manipulation causes release of resource. This vulnerability appears as CVE-2019-19956. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in libxml2 up to 2.9.9 (Document Processing Software) and classified as problematic. Affected by this vulnerability is the function xmlParseBalancedChunkMemoryRecover of the file parser.c. The manipulation with an unknown input leads to a release of resource vulnerability. The CWE definition for the vulnerability is CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. As an impact it is known to affect availability. The summary by CVE is:

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

The weakness was presented 12/24/2019. This vulnerability is known as CVE-2019-19956 since 12/24/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 233181 (Oracle Linux 7 : libxml2 (ELSA-2025-2673)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.9.10 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (233181). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Document Processing Software

Name

libxml2

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Release of resource
CWE: CWE-772 / CWE-400 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 233181
Nessus Name: Oracle Linux 7 : libxml2 (ELSA-2025-2673)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: libxml2 2.9.10
Patch: gitlab.gnome.org

Timelineinfo

12/24/2019 🔍
12/24/2019 +0 days 🔍
12/25/2019 +1 days 🔍
12/03/2025 +2170 days 🔍

Sourcesinfo

Advisory: USN-4274-1
Status: Confirmed

CVE: CVE-2019-19956 (🔍)
GCVE (CVE): GCVE-0-2019-19956
GCVE (VulDB): GCVE-100-147703

Entryinfo

Created: 12/25/2019 10:01
Updated: 12/03/2025 21:18
Changes: 12/25/2019 10:01 (38), 12/25/2019 10:06 (18), 03/16/2024 18:18 (6), 03/21/2025 22:10 (18), 12/03/2025 21:18 (1)
Complete: 🔍
Cache ID: 216::103