UW-IMAP upstream developers released new upstream version - 2007d - that fixes security issue in dmail and tmail utilities. Upstream announcement fails to detail those issue further.
References: http://mailman2.u.washington.edu/pipermail/imap-uw/2008-October/002267.html http://mailman2.u.washington.edu/pipermail/imap-uw/2008-October/002268.html