xmldom prior 0.8.15/0.9.12 DOMParser lib/sax.js normalize denial of service

Summaryinfo

A vulnerability labeled as problematic has been found in xmldom. Affected by this vulnerability is the function normalize of the file lib/sax.js of the component DOMParser. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2026-83614. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in xmldom. Affected by this issue is the function normalize of the file lib/sax.js of the component DOMParser. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is 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 versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart repeatedly rescans a malformed tag name to the next > during single-character recovery; in lib/dom.js, normalize() repeatedly removes and appends adjacent text nodes, causing quadratic reindexing and string rebuilding. The first path is reachable through default DOMParser.parseFromString() processing, while the second is also reachable through a direct normalize() call on a programmatically constructed DOM, and endDocument invokes that normalization after parsing. 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 available at github.com. This vulnerability is handled as CVE-2026-83614 since 08/31/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 0.8.15 or 0.9.12 eliminates this vulnerability.

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• xmldom

Website

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

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