Answer in brief
CVE-2026-83619 records a High severity (CVSS 8.7) vulnerability in xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser. The current sources do not mark it as known exploited. The current feed maps xmldom/xmldom (generic), @xmldom/xmldom (generic), @xmldom/xmldom (npm), @xmldom/xmldom (npm). 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/xmldom (npm), @xmldom/xmldom (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| xmldom/xmldomgeneric | >= 0.7.0, < 0.8.15 | Not reported |
| @xmldom/xmldomgeneric | >= 0.7.0, < 0.8.15 | Not reported |
| @xmldom/xmldomnpm | >=0.7.0,<=0.8.14 | 0.8.15 |
| @xmldom/xmldomnpm | >=0.7.0 <0.8.15 | 0.8.15 |
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. From 0.7.0 until 0.8.15, the release-0.8.x parser in lib/sax.js trims captured end-tag names with the unanchored global expression /[ \t\n\r]+$/g. For an end tag containing a long whitespace run followed by a non-whitespace character, the expression retries from each possible starting position and backtracks quadratically before failing its end anchor. DOMParser.parseFromString() reaches the path under default options, allowing a small unauthenticated XML input to stall the Node.js event loop; the 0.9.x and unscoped npm lines do not contain this expression. This issue is fixed in @xmldom/xmldom version 0.8.15.
Quoted source text, attributed separately from HOL analysis.