Answer in brief
CVE-2026-83607 records a High severity (CVSS 8.7) vulnerability in xmldom: Element name injection via createElement() bypasses requireWellFormed. The current sources do not mark it as known exploited. The current feed maps xmldom/xmldom (generic), @xmldom/xmldom (generic), xmldom (npm), @xmldom/xmldom (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps xmldom/xmldom (generic), @xmldom/xmldom (generic), xmldom (npm), @xmldom/xmldom (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| xmldom/xmldomgeneric | <= 0.6.0 | Not reported |
| @xmldom/xmldomgeneric | >= 0.7.0, < 0.8.14 || >= 0.9.0, < 0.9.11 | Not reported |
| xmldomnpm | <=0.6.0 | Not reported |
| @xmldom/xmldomnpm | >=0.9.0,<=0.9.10 | 0.9.11 |
| @xmldom/xmldomnpm | >=0.7.0,<=0.8.13 | 0.8.14 |
Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 1, 2026
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, Document.createElement(tagName) stores an unvalidated element name and XMLSerializer.serializeToString() emits that name verbatim. The requireWellFormed: true path did not validate the element qualified name or synthesized xmlns:PREFIX declaration, so attacker-controlled tag names could inject attributes, elements, or processing instructions into serialized XML or HTML and could cause cross-site scripting when browser-consumed. The unchecked values violate the XML QName constraint, and default serialization and creation-time createElement() behavior remain permissive. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.
Quoted source text, attributed separately from HOL analysis.