The bug was found with American Fuzzy Lop from optipng (<a href="https:&#x2F;&#x2F;bugs.debian.org&#x2F;cgi-bin&#x2F;bugreport.cgi?bug=787647" rel="nofollow">https:&#x2F;&#x2F;bugs.debian.org&#x2F;cgi-bin&#x2F;bugreport.cgi?bug=787647</a>) and later the optipng author noticed that the same bug also affects libpng (<a href="http:&#x2F;&#x2F;sourceforge.net&#x2F;p&#x2F;png-mng&#x2F;mailman&#x2F;png-mng-implement&#x2F;thread&#x2F;CA%2BPdXcuhLXJ89s6qjOEcm%2B99eWLmPBFcYSwcwJkajkLrNRLTeQ%40mail.gmail.com&#x2F;#msg34581085" rel="nofollow">http:&#x2F;&#x2F;sourceforge.net&#x2F;p&#x2F;png-mng&#x2F;mailman&#x2F;png-mng-implement&#x2F;t...</a>)