The array*recursive functions in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, related to recursion.
{ "binaries": [ { "binary_version": "3.11.1+dfsg-1ubuntu1", "binary_name": "hhvm" }, { "binary_version": "3.11.1+dfsg-1ubuntu1", "binary_name": "hhvm-dev" } ] }