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

Description

@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.

Recommendation

Update the @xmldom/xmldom package to the latest compatible version. Followings are version details:

• Affected version(s): **>= 0.9.0, < 0.9.9

  < 0.8.12**

• Patched version(s): **0.9.9

  0.8.12**

References

• GHSA-wh4c-j3r5-mjhp
• CVE-2026-34601
• CWE-91
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion - xmldom - CVE-2026-34601
• xmldom has XML node injection through unvalidated comment serialization - CVE-2026-41672
• xmldom has XML node injection through unvalidated processing instruction serialization - CVE-2026-41675
• xmldom has XML injection through unvalidated DocumentType serialization - CVE-2026-41674

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Tags:

npm

@xmldom/xmldom