xmldom: XML fragment injection via invalid EntityReference.nodeName during requireWellFormed serialization — GHSA-6GMQ-8VP8-GCM6

Summary

## Summary An `EntityReference` node can be created with an invalid, attacker-controlled name through `Document.createEntityReference(name)`. When this node is serialized directly with: ```js serializer.serializeToString(ref, { requireWellFormed: true }) ``` the invalid `nodeName` is emitted into the serialized XML fragment without validation or escaping. This can produce real XML markup in the serialized output.…

Timeline

Published by source

2026-09-02

Risk context

• Reported severity or threat level: medium.
• Reported CVSS score: 6.3 out of 10.
• Review exposure for the affected product or family: npm: @xmldom/xmldom | npm: xmldom.

Product

npm: @xmldom/xmldom | npm: xmldom

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-6GMQ-8VP8-GCM6

Source

GitHub

Vendor

GitHub

Published by source

2026-09-02

Last source activity

2026-09-02

Additional identifiers

CVE-2026-83610

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.