update for libpng12, libpng14
libpng was prone to a heap based buffer overflow vulnerability (bnc#747311)
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Submitted by
Petr Gajdos (pgajdos)
Fixed bugs
bnc#747311
Heap-buffer-overflow in png_decompress_chunk
CVE-CVE-2011-3026
Integer overflow in libpng, as used in Google Chrome before 17.0.963.56, allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors that trigger an integer truncation.
