xmldom: Quadratic-time attribute deduplication
CVE-2026-83613 is fixed in node-xmldom on 1 platform by DEBIAN-CVE-2026-83613 (version 0.9.12-1), released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.
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, DOMHandler.startElement in lib/dom-parser.js inserts every parsed attribute through setAttributeNode, while NamedNodeMap.setNamedItem in lib/dom.js calls the linear getNamedItem or getNamedItemNS lookup for each insertion. A well-formed element with many distinct attributes therefore requires quadratic comparisons during DOMParser.parseFromString() and can stall a Node.js event loop before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| node-xmldom · Debian 14 | 0.9.12-1 | DEBIAN-CVE-2026-83613 | Sep 8, 2026 |
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