See how redcarpet project compares to other vendors in security performance
Redcarpet is a Ruby library for Markdown processing. In Redcarpet before version 3.5.1, there is an injection vulnerability which can enable a cross-site scripting attack. In affected versions no HTML escaping was being performed when processing quotes. This applies even when the :escapehtml option was being used. This is fixed in version 3.5.1 by the referenced commit.
Stack-based buffer overflow in the headeranchor function in the HTML renderer in Redcarpet before 3.3.2 allows attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.