Last year, Joshua disclosed multiple vulnerabilities in Android's multimedia processing library libstagefright. This disclosure went viral under the moniker "Stagefright," garnered national press, and ultimately helped spur widespread change throughout the mobile ecosystem. Since initial disclosure, a multitude of additional vulnerabilities have been disclosed affecting the library.
In the course of his research, Joshua developed and shared multiple exploits for the issues he disclosed with Google. In response to Joshua and others' findings, the Android Security Team made many security improvements. Some changes went effective immediately, some later, and others still are set to ship with the next version of Android—Nougat.