system
Provide references for <CVE-2021-3986>.
user
Where can I find more information about <CVE-2021-3986>?
assistant
References are available at: https://huntr.com/bounties/394af194-61a7-4e33-b373-877d4c766fca, https://github.com/janeczku/calibre-web/commit/6f5390ead5df9779ac81fadefffb476e03f93548.