CVE-2026-34601

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.

• CWE-91
• CWE-91

• https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184
• https://github.com/xmldom/xmldom/releases/tag/0.8.12
• https://github.com/xmldom/xmldom/releases/tag/0.9.9
• https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp
• https://access.redhat.com/security/cve/CVE-2026-34601
• https://bugzilla.redhat.com/show_bug.cgi?id=2454595
• https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34601.json

Published

Apr 2, 2026

Last Modified

Jul 21, 2026

Status

Deferred

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