{"id":"CVE-2026-83605","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-83605","summary":"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…","details":"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, Element.setAttribute() calls the private _createAttribute(name) path without validating the attribute name, while Document.createAttribute(name) validates against QName. XMLSerializer.serializeToString() emits attribute names verbatim, and requireWellFormed: true did not validate them, so a crafted name can terminate the intended attribute and inject additional attributes, including event handlers, into browser-consumed output; synthesized xmlns:PREFIX declarations expose the same unchecked-name boundary. This issue is fixed in @xmldom/xmldom versions 0.8.14 and 0.9.11; no fixed version is available for xmldom.","published":"2026-09-01T15:17:38.317","modified":"2026-09-01T15:17:38.317","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e","label":"xmldom/xmldom@cba1321"},"references":[{"type":"WEB","url":"https://github.com/xmldom/xmldom/commit/cba1321218b069182695813fa7565653708e172e"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/commit/d8212e632507eaf1d9f609657dd4c56abeb12d44"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/pull/1043"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/pull/1050"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.8.14"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/releases/tag/0.9.11"},{"type":"WEB","url":"https://github.com/xmldom/xmldom/security/advisories/GHSA-4w3w-2rp5-g8jm"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T15:17:38.317"}}