Multiple buffer underflows in the (1) LZWDecode, (2) LZWDecodeCompat, and
(3) LZWDecodeVector functions in tif_lzw.c in the LZW decoder in LibTIFF
3.8.2 and earlier allow context-dependent attackers to execute arbitrary
code via a crafted TIFF file, related to improper handling of the
CODE_CLEAR code.

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