Vulnerability · Published Sep 1, 2026 · Assigned by GitHub_M
CVE-2026-83610xmldom: XML fragment injection via invalid EntityReference.nodeName during requireWellFormed serialization
Medium 6.3
In plain English
A medium-severity security flaw in xmldom from xmldom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, Document.createEntityReference(name) accepts an invalid name and the ENTITY_REFERENCE_NODE serializer emits the resulting nodeName directly in &name; form. Directly serializing the node or fragment with XMLSerializer.serializeToString() and requireWellFormed: true can therefore break the entity-reference boundary and produce attacker-controlled XML markup when reparsed. The parser does not ordinarily create these nodes, and element-child insertion is rejected, so exploitation requires an application to create and directly serialize an EntityReference. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | node-xmldom | no fix listed | DEBIAN-CVE-2026-83610 |
| Debian:13 | node-xmldom | no fix listed | DEBIAN-CVE-2026-83610 |
| Debian:14 | node-xmldom | 0.9.12-1 | DEBIAN-CVE-2026-83610 |
| Ubuntu:22.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83610 |
| Ubuntu:24.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83610 |
| Ubuntu:26.04:LTS | node-xmldom | no fix listed | UBUNTU-CVE-2026-83610 |
| Ubuntu:26.10 | node-xmldom | no fix listed | UBUNTU-CVE-2026-83610 |
| npm | @xmldom/xmldom | 0.8.15 | GHSA-6gmq-8vp8-gcm6 |
| npm | @xmldom/xmldom | 0.9.12 | GHSA-6gmq-8vp8-gcm6 |
| npm | xmldom | no fix listed | GHSA-6gmq-8vp8-gcm6 |
Affected products (as reported)
Weakness: CWE-116 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/xmldom/xmldom/security/advisories/GHSA-6gmq-8vp8-gcm6 x_refsource_CONFIRM
- https://github.com/xmldom/xmldom/pull/1071 x_refsource_MISC
- https://github.com/xmldom/xmldom/pull/1072 x_refsource_MISC
- https://github.com/xmldom/xmldom/commit/4664386e4f4d99d17b416a151dbe8323e245284b x_refsource_MISC
- https://github.com/xmldom/xmldom/commit/6c3fb5ffeafe7901ec928ce9010988dd716c94a0 x_refsource_MISC
- https://github.com/xmldom/xmldom/releases/tag/0.8.15 x_refsource_MISC
- https://github.com/xmldom/xmldom/releases/tag/0.9.12 x_refsource_MISC