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CVE-2026-83609— xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path

Quick assessment

Affected
xmldom xmldom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xmldom 是一个纯 JavaScript 的 W3C 标准（XML DOM Level 2 Core）DOMParser 和 XMLSerializer 模块。在 0.9.0 到 0.9.12 版本中，lib/grammar.js 中共享的 reg() 构建函数在编译带锚点的 QName_exact 校验器时使用了多行标志，导致 和 仅对单行进行校验，而非对整个名称进行校验。因此， 、 、 和 会接受格式错误的 XML 名称：其首行有效，而后续文本在通过默认路径或 序列化时会注入标记。触发此问题的 ECMASc

CVSS 8.7 · High
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I. Basic Information for CVE-2026-83609

Vulnerability Information
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Vulnerability Title
xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line terminator, allowing injection on the default serialization path
Source: CVE Program / CVE List V5
Vulnerability Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0 until 0.9.12, the shared reg() builder in lib/grammar.js compiles the anchored QName_exact validator with the multiline flag, so ^ and $ validate only one line instead of the complete name. createElementNS, createAttributeNS, createDocumentType, and createAttribute consequently accept a malformed XML name whose first line is valid and whose later text injects markup when serialized through either the default path or requireWellFormed: true. The triggering ECMAScript line terminators are U+000A, U+000D, U+2028, and U+2029. This issue is fixed in @xmldom/xmldom version 0.9.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML注入(XPath盲注)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xmldom xmldom >= 0.9.0, < 0.9.12 -
@xmldom xmldom >= 0.9.0, < 0.9.12 -

II. Public POCs for CVE-2026-83609

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III. Intelligence Information for CVE-2026-83609

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Other References for CVE-2026-83609 (4)

Same Patch Batch · xmldom · 2026-09-01 · 10 CVEs total

CVE-2026-83605 8.7 HIGH xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed
CVE-2026-83606 8.7 HIGH xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructi
CVE-2026-83607 8.7 HIGH xmldom: Element name injection via createElement() bypasses requireWellFormed
CVE-2026-83613 8.7 HIGH xmldom: Quadratic-time attribute deduplication
CVE-2026-83612 8.7 HIGH xmldom: HTML raw-text closing-tag case mismatch causes output amplification
CVE-2026-83614 8.7 HIGH xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartP
CVE-2026-83608 8.7 HIGH xmldom: DocType `name` Injection Bypasses requireWellFormed
CVE-2026-83611 6.9 MEDIUM xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line
CVE-2026-83610 6.3 MEDIUM xmldom: XML fragment injection via invalid EntityReference.nodeName during requireWellForm

IV. Related Vulnerabilities

Same product: xmldom
Same vendor: xmldom
Same weakness: CWE-91

V. Comments for CVE-2026-83609

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