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.

References

https://github.com/xmldom/xmldom/security/advisories/GHSA-965w-775f-mr7g

https://github.com/xmldom/xmldom/releases/tag/0.9.12

https://github.com/xmldom/xmldom/releases/tag/0.8.15

https://github.com/xmldom/xmldom/pull/1072

https://github.com/xmldom/xmldom/pull/1071

https://github.com/xmldom/xmldom/commit/dabffe884e864eeecb1f515c716f875e1bc47ec1

https://github.com/xmldom/xmldom/commit/954370f58c046223faf95ba77efcbc8ce014409d

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4