Heap-based buffer overflow in bogofilter 0.96.2 0.95.2 0.94.14 0.94.12 and other versions from 0.93.5 to 0.96.2 when using Unicode databases allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via \invalid input sequences\ that lead to heap corruption when bogofilter or bogolexer converts character sets.