CVE-2025-58767: Ruby-Lang Rexml

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

REXML is an XML toolkit for Ruby. The REXML gems from 3.3.3 to 3.4.1 has a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted XMLs, you may be impacted to these vulnerabilities. The REXML gem 3.4.2 or later include the patches to fix these vulnerabilities.

Affected products

• Ruby-Lang Rexml: from 3.3.3, before 3.4.2 (fixed in 3.4.2)

Published 2025-09-17. Last modified 2026-06-17.