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CVE-2026-83617— xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator

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 is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/g

CVSS 8.7 · High
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I. Basic Information for CVE-2026-83617

Vulnerability Information
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Vulnerability Title
xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded line terminator
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 0.9.11 until 0.9.12, the requireWellFormed: true element and attribute name checks use the anchored QName_exact expression produced by reg() in lib/grammar.js, which inherits the multiline flag. A name with a valid first line followed by U+000A, U+000D, U+2028, or U+2029 and breakout markup therefore passes validation and is emitted verbatim in element start and end tags or attribute names. This bypasses the strict-serialization checks introduced for the earlier element-name and attribute-name injection advisories, while the default serialization path remains outside the strict guarantee. 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 >= 0.9.11, < 0.9.12 -
@xmldom xmldom >= 0.9.11, < 0.9.12 -

II. Public POCs for CVE-2026-83617

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III. Intelligence Information for CVE-2026-83617

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Other References for CVE-2026-83617 (3)

Same Patch Batch · xmldom · 2026-09-01 · 15 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-2026-83609 8.7 HIGH xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line termina
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-2026-83615 8.7 HIGH xmldom: Quadratic-memory consumption
CVE-2026-83619 8.7 HIGH xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag
CVE-2026-83618 8.7 HIGH xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedd
CVE-2026-83616 8.7 HIGH xmldom: Processing Instruction Target 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-2026-83617

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