{"cve":"CVE-2026-83619","nvd":{"published":"2026-09-01T15:17:40.657","modified":"2026-09-08T21:11:31.703","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":null,"cwes":["CWE-400","CWE-1333"],"references":["https://github.com/xmldom/xmldom/commit/3abb0934f5a8a84d83a1f9cde0f2bd04c08b2a09","https://github.com/xmldom/xmldom/pull/1072","https://github.com/xmldom/xmldom/releases/tag/0.8.15","https://github.com/xmldom/xmldom/security/advisories/GHSA-x4fp-j954-r2f4"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-83619","score":0.00524,"percentile":0.44448,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-x4fp-j954-r2f4","url":"https://osv.dev/vulnerability/GHSA-x4fp-j954-r2f4","summary":"xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser","modified":"2026-09-08T21:15:04.998562447Z","packages":[{"ecosystem":"npm","name":"@xmldom/xmldom","purl":"pkg:npm/%40xmldom/xmldom","ranges":[">=0.7.0 <0.8.15"],"fixed":["0.8.15"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}