Answer in brief
CVE-2026-83611 records a Medium severity (CVSS 6.9) vulnerability in xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content. The current sources do not mark it as known exploited. The current feed maps xmldom/xmldom (generic), @xmldom/xmldom (generic), xmldom (npm), 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 6.9. 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 (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 | >= 0.9.0, < 0.9.12 || >= 0.7.0, < 0.8.15 | Not reported |
| xmldomnpm | <=0.6.0 | Not reported |
| xmldomnpm | >=0 | Not reported |
| @xmldom/xmldomnpm | >=0.7.0 <0.8.15 | 0.8.15 |
| @xmldom/xmldomnpm | >=0.9.0 <0.9.12 | 0.9.12 |
| @xmldom/xmldomnpm | >=0.7.0,<=0.8.14 | 0.8.15 |
| @xmldom/xmldomnpm | >=0.9.0,<=0.9.11 | 0.9.12 |
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 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as </a\njunk>, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Quoted source text, attributed separately from HOL analysis.