GHSA-X8G9-H984-PC36 PhpWeasyPrint vulnerable to SSRF and local file disclosure via the attachment option

Summary pontedilana/php-weasyprint fetches the content of option values server-side via filegetcontents when the value looks like a URL, without restricting the URL scheme. The attachment option of Pdf is the reachable sink: any value that passes isOptionUrl filtervar..., FILTERVALIDATEURL is...