CVSS 4.0
8.7 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2026-83615
High (8.7). EPSS 0.6% chance of exploitation in the next 30 days. Fixed in @xmldom/xmldom 0.8.15, 0.9.12.
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.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-31)
- CWE
- CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-965w-775f-mr7g | npm | @xmldom/xmldom | >=0.7.0 <0.8.15 | 0.8.15 |
| GHSA-965w-775f-mr7g | npm | @xmldom/xmldom | >=0.9.0 <0.9.12 | 0.9.12 |
| GHSA-965w-775f-mr7g | npm | xmldom | >=0.1.5 <=0.6.0 | no fix published |