Provide references for CVE-2018-6340.
Where can I find more information about CVE-2018-6340?
References are available at: https://hhvm.com/blog/2018/12/18/hhvm-3.30.1.html, https://github.com/facebook/hhvm/commit/4bff3bfbe90d10451e4638c2118d1ad1117bb3e3.