Alpine: multiple libxml2 packages, multiple py3-libxml2 packages: security update to 2.13.9-r0

low Tenable Self-Hosted Container Security Plugin ID 435540

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

- A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations
can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of
service when processing crafted input. (CVE-2025-6021)

- A flaw was found in the interactive shell of the xmllint command-line tool, used for parsing XML files.
When a user inputs an overly long command, the program does not check the input size properly, which can
cause it to crash. This issue might allow attackers to run harmful code in rare configurations without
modern protections. (CVE-2025-6170)

- A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under
certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw
allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the
program's crash using libxml or other possible undefined behaviors. (CVE-2025-49794)

- A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This
flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.
(CVE-2025-49795)

- A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can
trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that
can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to
sensitive data being corrupted in memory. (CVE-2025-49796)

Plugin Details

Severity: Low

ID: 435540

Version: Revision 1.4

Type: Local

Family: Alpine Linux Local Security Checks

Published: 10/9/2025

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.3

Percentile: 96.81

CVSS v2

Risk Factor: Low

Base Score: 1.2

Temporal Score: 0.9

Vector: CVSS2#AV:L/AC:H/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2025-6170

CVSS v3

Risk Factor: Low

Base Score: 2.5

Temporal Score: 2.3

Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 6/12/2025

Reference Information

CVE: CVE-2025-49794, CVE-2025-49795, CVE-2025-49796, CVE-2025-6021, CVE-2025-6170

IAVA: 2025-A-0707

Detections

Analytics