Stack-based buffer overflow in the ldif_get_line function in ldif.c of Sylpheed before 2.1.6 allows user-assisted attackers to execute arbitrary code by having local users import LDIF files with long lines.

Buffer overflow in Sylpheed before 1.0.4 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via attachments with MIME-encoded file names.

Buffer overflow in Sylpheed before 1.0.3 and other versions before 1.9.5 allows remote attackers to execute arbitrary code via an e-mail message with certain headers containing non-ASCII characters that are not properly handled when the user replies to the message.