Provide references for CVE-2021-23639.
Where can I find more information about CVE-2021-23639?
References are available at: https://snyk.io/vuln/SNYK-JS-MDTOPDF-1657880, https://github.com/simonhaenisch/md-to-pdf/issues/99, https://github.com/simonhaenisch/md-to-pdf/commit/a716259c548c82fa1d3b14a3422e9100619d2d8a.