Gentoo Linux Security Advisory 201908-2 - Multiple vulnerabilities have been found in libpng, the worst of which could result in a Denial of Service condition. Versions less than 1.6.37:0 are affected.
049560f96c3f453ba6e827ec0814d8153b2f4a16c5d22d9ae2dce2d80c5fcf92
Slackware Security Advisory - New libpng packages are available for Slackware 14.2 and -current to fix security issues.
b4b4ff26daa8f526e4c76b925e9cc0e3c2f76e411f39dbcfe285ebe048d92080