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.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/83xxx/CVE-2026-83615.json",
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-770"
]
}{
"source": "AFFECTED_FIELD",
"extracted_events": [
{
"introduced": "0.1.5"
},
{
"last_affected": "0.6.0"
},
{
"introduced": "0.7.0"
},
{
"fixed": "0.8.15"
},
{
"introduced": "0.9.0"
},
{
"fixed": "0.9.12"
}
]
}