Resolved Bugs451025 - crash in mailimf_group_parse due to a colon in To: addressUpdate to new upstream version 0.54 fixing a crash (NULL pointer dereference) in the mail message header parser.
Note: There is no application in Fedora using libetpan library for which such crash could be considered a security issue. This can only be a security sensitive issue for some 3rd party, not packages applications.