HHVM 3.30.1 and 3.27.5 are released; these releases address CVE-2018-6340, a stack read overflow in Memcache::getExtendedStats(). Exploiting this requires control over memcached server hostnames and/or ports.


  • 3.27.5 includes a fix for type coverage IDE support
  • our Mac binaries have been rebuilt to require sandybridge (model year 2011 or later). This provides a 10x performance improvement on some common workloads.