CVE-2015-7700
Double-free vulnerability in the sPLT chunk structure and png.c in pngcrush before 1.7.87 allows attackers to have unspecified impact via unknown vectors.
Date published : 2017-08-31
http://pmt.sourceforge.net/pngcrush/changelog.html
https://sourceforge.net/p/pmt/news/2015/10/pngcrush-1787-released/