Stack-based buffer overflow in the TIFFVGetField function in tifdir.c in LibTIFF 4.0.0alpha4, 4.0.0alpha5, 4.0.0alpha6, 4.0.0beta7, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.0.4, 4.0.4beta, 4.0.5, 4.0.6, 4.0.7 and 4.0.8 allows remote attackers to cause a denial of service (crash) via a crafted TIFF file.