xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedded line terminator

Summary An embedded line terminator bypasses the requireWellFormed serializer check for a DocumentType's publicId and systemId. The check was added to fix GHSA-f6ww-3ggp-fr8h; an id whose first line is a valid literal slips past it and is emitted verbatim into the declaration, so the markup after...

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...