GHSA-VR34-HP96-76PP 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...