tiffttopnm in netpbm 10.47.63 does not properly use the libtiff TIFFRGBAImageGet function, which allows remote attackers to cause a denial of service (out-of-bounds read and write) via a crafted tiff image file, related to transposing width and height values.
http://www.securityfocus.com/bid/96011
http://www.openwall.com/lists/oss-security/2017/02/02/2