CVE-2015-7981
Added a safety check in png_set_tIME() (Bug report from Qixue Xiao).
CVE-2015-8126
Multiple buffer overflows in the (1) png_set_PLTE and
(2) png_get_PLTE functions in libpng before 1.0.64, 1.1.x and 1.2.x
before 1.2.54, 1.3.x and 1.4.x before 1.4.17, 1.5.x before 1.5.24,
and 1.6.x before 1.6.19 allow remote attackers to cause a denial
of service (application crash) or possibly have unspecified other
impact via a small bit-depth value in an IHDR (aka image header)
chunk in a PNG image.