CVE-2026-83619

xmldom (a pure JavaScript W3C-compliant DOMParser and XMLSerializer module) is vulnerable to a ReDoS (Regular Expression Denial of Service) in versions 0.7.0 through 0.8.15 . The root cause is an unanchored global regex /[ \t\n\r]+$/g in lib/sax.js that trims end-tag names; when an end tag contai...

CVE-2026-83619 xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser

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...

CVE-2026-83619 xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag parser

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...

CVE-2026-83618

xmldom is a pure JavaScript W3C DOMParser/XMLSerializer module. In versions 0.9.10 through 0.9.12 , the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId using regexes (PubidLiteral_match, SystemLiteral_match) that inherit the multiline flag . A valid li...

CVE-2026-83618

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteralmatch and SystemLiteralmatch expressions produced by...

CVE-2026-83618 xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedded line terminator

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteralmatch and SystemLiteralmatch expressions produced by...

CVE-2026-83618 xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedded line terminator

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. From 0.9.10 until 0.9.12, the requireWellFormed: true serializer validates DocumentType.publicId and DocumentType.systemId with PubidLiteralmatch and SystemLiteralmatch expressions produced by...

CVE-2026-83617

@xmldom/xmldom versions 0.9.11 through 0.9.12 contain a regex bypass in the requireWellFormed: true validation path. The QName_exact anchored expression in lib/grammar.js inherits the multiline flag , so an element or attribute name that is valid on its first line but contains U+000A, U+000D, U+2...

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

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 QNameexact expression produced by reg in lib/grammar.js, which inherits the multiline...

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

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 QNameexact expression produced by reg in lib/grammar.js, which inherits the multiline...

CVE-2026-83617

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 QNameexact expression produced by reg in lib/grammar.js, which inherits the multiline...

CVE-2026-83616

xmldom , a pure JavaScript W3C-standard XML DOM module, is affected by a Processing Instruction Target Injection vulnerability. In Document.createProcessingInstruction(target, data) within lib/dom.js, the target parameter is accepted without validation. The requireWellFormed: true serializer only...

CVE-2026-83616

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, Document.createProcessingInstructiontarget, data in lib/dom.js accepts an unvalidated target, while...

CVE-2026-83616 xmldom: Processing Instruction Target Injection Bypasses requireWellFormed

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, Document.createProcessingInstructiontarget, data in lib/dom.js accepts an unvalidated target, while...

CVE-2026-83615

xmldom , a pure JavaScript XML DOM parser, has a quadratic memory consumption flaw in appendElement within lib/sax.js. The function clones the entire namespace map (currentNSMap) via _copy for every nested element that declares a new namespace prefix, keeping all ancestor maps alive on the parse ...

CVE-2026-83615

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses copy to clone the complete currentNSMap for each nested element...

CVE-2026-83615 xmldom: Quadratic-memory consumption

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses copy to clone the complete currentNSMap for each nested element...

CVE-2026-83615 xmldom: Quadratic-memory consumption

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.1.5 through 0.6.0, appendElement in lib/sax.js uses copy to clone the complete currentNSMap for each nested element...

CVE-2026-83614

xmldom , a pure JavaScript XML DOM parser, is vulnerable to quadratic-time denial of service via two independent code paths. The first, in lib/sax.js, causes parseElementStartPart to repeatedly rescan a malformed tag name to the next > during single-character recovery, reachable through the de...

CVE-2026-83614 xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartPart` re-scan and `normalize()` adjacent-text merge

xmldom is a pure JavaScript W3C standard-based XML DOM Level 2 Core DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart...