system
Provide references for <CVE-2021-3988>.
user
Where can I find more information about <CVE-2021-3988>?
assistant
References are available at: https://huntr.com/bounties/fa4c8fd1-7846-4dad-9112-2c07461f0609, https://github.com/janeczku/calibre-web/commit/7ad419dc8c12180e842a82118f4866ac3d074bc5.