Dompdf 1.2.1 allows remote code execution via a .php file in the src:url field of an @font-face Cascading Style Sheets (CSS) statement (within an HTML input file).
packetstormsecurity.com/files/171738/Dompdf-1.2.1-Remote-Code-Execution.html
github.com/dompdf/dompdf/commit/4c70e1025bcd9b7694b95dd552499bd83cd6141d
github.com/dompdf/dompdf/issues/2598
github.com/dompdf/dompdf/pull/2808
github.com/snyk-labs/php-goof
packagist.org/packages/dompdf/dompdf#v1.2.1
snyk.io/blog/security-alert-php-pdf-library-dompdf-rce/