CVE-2026-83615
Description
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 0.1.5 through 0.6.0, appendElement in lib/sax.js uses _copy to clone the complete currentNSMap for each nested element that declares a new namespace prefix. Keeping every ancestor map live on the parse stack creates quadratic peak namespace-map storage, so a small highly compressible XML document can exhaust the process heap 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.
How to fix
- @xmldom/xmldom0.8.15, 0.9.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @xmldom/xmldomnpm | 0.7.0 ≤ v < 0.8.15, 0.9.0 ≤ v < 0.9.12 | 0.8.15, 0.9.12 |
| xmldomnpm | 0.1.5 ≤ v ≤ 0.6.0 | — |
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