CVE intelligence

CVE-2024-43398

Vulnerability intelligence

Published Aug 22, 2024Sources checked Nov 11, 2026

5.9MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2024-43398 and is rated Medium severity with a CVSS score of 5.9. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

What to do next

Remediation and response

Microsoft Security Response Center guidance

Vendor revision: Aug 12, 2026

Vendor remediation details

CBL-Mariner Releases

Vendor-listed releases

3.3.5-1
3.3.9-1
3.1.7-1
3.2.9-1

CISA KEVNot listedBased on the latest collected catalog

EPSS1.2%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2024-43398?

REXML is an XML toolkit for Ruby. The REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes.

If you need to parse untrusted XMLs with tree parser API like REXML::Document.new, you may be impacted to this vulnerability. If you use other parser APIs such as stream parser API and SAX2 parser API, this vulnerability is not affected.

The REXML gem 3.3.6 or later include the patch to fix the vulnerability.

Source: NVD