xmldom up to 0.9.11 lib/grammar.js createElementNS xml injection

Summaryinfo

A vulnerability marked as critical has been reported in xmldom up to 0.9.11. Affected by this issue is the function createElementNS of the file lib/grammar.js. Performing a manipulation results in xml injection. This vulnerability is known as CVE-2026-83609. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in xmldom up to 0.9.11. This affects the function createElementNS of the file lib/grammar.js. The manipulation with an unknown input leads to a xml injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the shared reg() builder in lib/grammar.js compiles the anchored QName_exact validator with the multiline flag, so ^ and $ validate only one line instead of the complete name. createElementNS, createAttributeNS, createDocumentType, and createAttribute consequently accept a malformed XML name whose first line is valid and whose later text injects markup when serialized through either the default path or requireWellFormed: true. The triggering ECMAScript line terminators are U+000A, U+000D, U+2028, and U+2029. This issue is fixed in @xmldom/xmldom version 0.9.12.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-83609 since 08/31/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK.

Upgrading to version 0.9.12 eliminates this vulnerability.

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Productinfo

Name

• xmldom

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11

Website

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

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