In LibTIFF 4.0.8, there is a heap-based use-after-free in the t2p_writeproc function in tiff2pdf.c. NOTE: there is a third-party report of inability to reproduce this issue
https://bugzilla.redhat.com/show_bug.cgi?id=1530912
https://bugzilla.novell.com/show_bug.cgi?id=1074318