CVE-2026-83615
Fixed in a distro release EPSS <1%CVSS 8.7
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.
Products: xmldom
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| npm | @xmldom/xmldom | 0.8.15 |
| npm | @xmldom/xmldom | 0.9.12 |
| npm | xmldom | no fix |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | gitlab-rails-ce-18.11 | 18.11.11-r2 |
| Chainguard | gitlab-rails-ce-19.0 | 19.0.10-r0 |
| Chainguard | gitlab-rails-ce-fips-19.0 | 19.0.9-r3 |
| Debian 12 | node-xmldom | no fix |
| Debian 13 | node-xmldom | no fix |
| Debian 14 | node-xmldom | 0.9.12-1 |
| Ubuntu 20.04 LTS | node-xmldom | no fix |
| Ubuntu 22.04 LTS | node-xmldom | no fix |
| Ubuntu 24.04 LTS | node-xmldom | no fix |
| Ubuntu 26.04 LTS | node-xmldom | no fix |
| Ubuntu 26.10 | node-xmldom | no fix |