Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
xmldom xmldom
xmldom <= 0.6.0affected@xmldom/xmldom < 0.8.12affected@xmldom/xmldom >= 0.9.0, < 0.9.9affected
References
- https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp ↗
- 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://access.redhat.com/security/cve/CVE-2026-34601 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2454595 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34601.json ↗