CVE-2026-83619
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @xmldom/xmldom | >= 0.7.0, <= 0.8.14 | 0.8.15 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-x4fp-j954-r2f4
- https://github.com/xmldom/xmldom/security/advisories/GHSA-x4fp-j954-r2f4
- https://nvd.nist.gov/vuln/detail/CVE-2026-83619
- https://github.com/xmldom/xmldom/pull/1072
- https://github.com/xmldom/xmldom/commit/3abb0934f5a8a84d83a1f9cde0f2bd04c08b2a09
- https://github.com/xmldom/xmldom/releases/tag/0.8.15