xmldom DocumentType Name lib/dom.js createDocumentType xml injection

Summaryinfo

A vulnerability classified as critical was found in xmldom. Affected by this issue is the function createDocumentType of the file lib/dom.js of the component DocumentType Name Handler. Executing a manipulation can lead to xml injection. The identification of this vulnerability is CVE-2026-83608. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in xmldom (version unknown). This vulnerability affects the function createDocumentType of the file lib/dom.js of the component DocumentType Name Handler. The manipulation with an unknown input leads to a xml injection vulnerability. The CWE definition for the vulnerability is CWE-91. The product does not properly neutralize special elements that are used in XML, allowing attackers to modify the syntax, content, or commands of the XML before it is processed by an end system. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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, the DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset under requireWellFormed: true but emits DocumentType.name verbatim. A name containing > or whitespace can terminate the <!DOCTYPE ...> declaration and inject sibling markup; the value can be supplied through createDocumentType() on the 0.8.x and unscoped lines or through a direct DocumentType.name property write on every affected line. The default path and legacy creation-time behavior remain permissive, while the vulnerable strict path fails to enforce an XML Name. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-83608 since 08/31/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/01/2026). The MITRE ATT&CK project declares the attack technique as T1505.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Name

• xmldom

Website

• Product: https://github.com/xmldom/xmldom/

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