CVE-2026-83605
Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.14 and 0.9.11, and in xmldom version 0.6.0 and earlier, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; 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 | >= 0.9.0, < 0.9.11 | 0.9.11 |
@xmldom/xmldomnpm | >= 0.7.0, < 0.8.14 | 0.8.14 |
xmldomnpm | <= 0.6.0 | — |
Affected products
1Patches
Vulnerability mechanics
References
9- github.com/advisories/GHSA-4w3w-2rp5-g8jmghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-83605ghsaADVISORY
- github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172envdWEB
- github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44nvdWEB
- github.com/xmldom/xmldom/pull/1043nvdWEB
- github.com/xmldom/xmldom/pull/1050nvdWEB
- github.com/xmldom/xmldom/releases/tag/0.8.14nvdWEB
- github.com/xmldom/xmldom/releases/tag/0.9.11nvdWEB
- github.com/xmldom/xmldom/security/advisories/GHSA-4w3w-2rp5-g8jmnvdWEB
News mentions
1- Xmldom npm Package: Fifteen Parsing and Serialization Vulnerabilities Disclosed TogetherVypr Intelligence · Sep 1, 2026