CVE-2015-8540
underflow read in png_check_keyword in pngwutil.c
CVE-2012-3425
The png_push_read_zTXt function in pngpread.c in libpng 1.0.x
before 1.0.58, 1.2.x before 1.2.48, 1.4.x before 1.4.10, and
1.5.x before 1.5.10 allows remote attackers to cause a denial
of service (out-of-bounds read) via a large avail_in field value
in a PNG image.