CVE-2026-34601

The record

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]> to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.

Affected packages

Related vulnerabilities

• GHSA-wh4c-j3r5-mjhp xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup… Same vulnerability
• CVE-2026-41672 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and… Also affects @xmldom/xmldom
• CVE-2026-41675 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and… Also affects @xmldom/xmldom
• CVE-2026-41673 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and… Also affects @xmldom/xmldom
• CVE-2026-41674 xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and… Also affects @xmldom/xmldom
• GHSA-2v35-w6hq-6mfw xmldom: Uncontrolled recursion in XML serialization leads to DoS Also affects @xmldom/xmldom
• GHSA-f6ww-3ggp-fr8h xmldom has XML injection through unvalidated DocumentType serialization Also affects @xmldom/xmldom
• GHSA-x6wf-f3px-wcqx xmldom has XML node injection through unvalidated processing instruction serialization Also affects @xmldom/xmldom