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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@xmldom/xmldomnpm | >= 0.7.0, < 0.8.15 | 0.8.15 |
@xmldom/xmldomnpm | >= 0.9.0, < 0.9.12 | 0.9.12 |
xmldomnpm | >= 0.1.5, <= 0.6.0 | — |
Affected products
1Patches
Vulnerability mechanics
References
9- github.com/advisories/GHSA-965w-775f-mr7gghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-83615ghsaADVISORY
- github.com/xmldom/xmldom/commit/954370f58c046223faf95ba77efcbc8ce014409dnvdWEB
- github.com/xmldom/xmldom/commit/dabffe884e864eeecb1f515c716f875e1bc47ec1nvdWEB
- github.com/xmldom/xmldom/pull/1071nvdWEB
- github.com/xmldom/xmldom/pull/1072nvdWEB
- github.com/xmldom/xmldom/releases/tag/0.8.15nvdWEB
- github.com/xmldom/xmldom/releases/tag/0.9.12nvdWEB
- github.com/xmldom/xmldom/security/advisories/GHSA-965w-775f-mr7gnvdWEB
News mentions
1- Xmldom npm Package: Fifteen Parsing and Serialization Vulnerabilities Disclosed TogetherVypr Intelligence · Sep 1, 2026