The tagCompare function in tif_dirinfo.c in the thumbnail tool in LibTIFF 4.0.6 and earlier allows remote attackers to cause a denial of service (out-of-bounds read) via vectors related to field_tag matching.Referenceshttp://www.openwall.com/lists/oss-security/2016/04/08/13http://www.securityfocus.com/bid/93335https://security.gentoo.org/glsa/201701-16http://bugzilla.maptools.org/show_bug.cgi?id=2547
