CVE-2026-83614

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.

• CWE-400
• CWE-407

• https://github.com/xmldom/xmldom/commit/0748720b620555f8c222782dcab575cf0cf403b4
• https://github.com/xmldom/xmldom/commit/f40ccb861eee0acbf5ee4feb9a34932e87b329c9
• https://github.com/xmldom/xmldom/pull/1071
• https://github.com/xmldom/xmldom/pull/1072
• https://github.com/xmldom/xmldom/releases/tag/0.8.15
• https://github.com/xmldom/xmldom/releases/tag/0.9.12
• https://github.com/xmldom/xmldom/security/advisories/GHSA-93r5-fhx6-vmg9

Published

Sep 1, 2026

Last Modified

Sep 1, 2026

Status

Received

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