High 7.5Published Apr 2, 2026

CVE-2026-34601xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion

Updated under an hour ago (Oct 26, 2026, 4:23 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for xmldom

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-91
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

xmldom xmldom xmldom:xmldom (from the name)	xmldom <= 0.6.0; @xmldom/xmldom < 0.8.12; @xmldom/xmldom >= 0.9.0, < 0.9.9	CNA record
Red Hat Migration Toolkit for Applications 8 redhat:migration_toolkit_applications	8	CISA ADP
Red Hat Red Hat Build of Podman Desktop redhat:podman_desktop	1	CISA ADP
Red Hat Red Hat Developer Hub redhat:rhdh	1	CISA ADP
Red Hat Red Hat Fuse 7 redhat:jboss_fuse	7	CISA ADP
Red Hat Red Hat OpenShift AI (RHOAI) redhat:openshift_ai	Versions not stated	CISA ADP
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift	4	CISA ADP
Red Hat Red Hat OpenShift Dev Spaces redhat:openshift_devspaces	3	CISA ADP
Red Hat Self-service automation portal 2 redhat:ansible_portal	2	CISA ADP

References

References

https://github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp	x-refsource-confirm
https://github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184	x-refsource-misc
https://github.com/xmldom/xmldom/releases/tag/0.8.12	x-refsource-misc
https://github.com/xmldom/xmldom/releases/tag/0.9.9	x-refsource-misc
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.