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Vulnerability record · CVE-2026-34601 · published 2 April 2026

CVE-2026-34601: XML injection vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.54% · top 57.1% CWE-91 · XML injection Deferred
7.5CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
21 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-34601), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.