Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. This issue has been pa

### Summary When authenticating a connection with `SCRAM-SHA1` or `SCRAM-SHA256`, a hostile server can perform a computational denial-of-service attack on the client process by sending a big iteration count value. ### Details A hostile IMAP server can send an arbitrarily large PBKDF2 iteration count in the SCRAM server-first-message, causing the client to perform an expensive `OpenSSL::KDF.pbkd