mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

mutt before 2.3.2 has an infinite loop in data_object_to_stream in crypt-gpgme.c.

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

mutt before 2.3.2 does not check for '\0' in url_pct_decode.

mutt before 2.3.2 sometimes truncates the hash_passwd by one byte for IMAP auth_cram MD5 digest.

mutt before 2.3.2 sometimes uses strfcpy instead of memcpy for the IMAP auth_cram MD5 digest.

Mutt does not verify that the smtps server hostname matches the domain name of the subject of an X.509 certificate, which allows man-in-the-middle attackers to spoof an SSL SMTP server via an arbitrary certificate, a different vulnerability than CVE-2009-3766.