BUG: Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/^(http|https)://%{ <-- HERE HTTP_HOST}(/.*)$/ at /usr/share/webmin/virtual-server/list_redirects.cgi line 20

Hello,

find /usr/share -name list_redirects.cgi

This is a known and a solved issue: