Detections
Analytics

Echo: libxml2-2.9.1: security update to 2.9.1+e1

medium Tenable Self-Hosted Container Security Plugin ID 476485

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while
 parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery
 mode and post-validated, the flaw could be used to crash the application. The highest threat from this
 vulnerability is to system availability. (CVE-2021-3537)

Solution

Update the libxml2-2.9.1 library and its related packages to version 2.9.1+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2021-3537

Plugin Details

Severity: Medium

ID: 476485

Version: Revision 1.1

Type: Local

Published: 10/21/2026

Updated: 10/21/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.69

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2021-3537

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2026

Vulnerability Publication Date: 5/14/2021

Reference Information

CVE: CVE-2021-3537