Provide references for CVE-2021-23206.
Where can I find more information about CVE-2021-23206?
References are available at: https://github.com/michaelrsweet/htmldoc/issues/416, https://bugzilla.redhat.com/show_bug.cgi?id=1967028, https://ubuntu.com/security/CVE-2021-23206, https://github.com/michaelrsweet/htmldoc/commit/ba61a3ece382389ae4482c7027af8b32e8ab4cc8.