The png_do_expand_palette function in libpng before 1.6.8 allows
remote attackers to cause a denial of service (NULL pointer
dereference and application crash) via (1) a PLTE chunk of zero bytes
or (2) a NULL palette, related to pngrtran.c and pngset.c.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
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