www.tomshardware.com/news/valve-patches-source-sdk-vulnerability,35052.html
Y Pues resulta que era posible enviar un "payload" conteniendo código malicioso cuando morías en ciertos juegos basados en el engine de SOURCE (de Valve)
A vulnerability in Valve's Source SDK, however, could have allowed someone to compromise your system by killing you in a game like Team Fortress 2 or Counter Strike: Global Offensive. But don't worry--the company that discovered the vulnerability, One Up Security, said Valve has already released a patch.
One Up Security said that the Source SDK contained "a buffer overflow vulnerability which allowed remote code execution on clients and servers." The vulnerability was exploited by loading a specially crafted ragdoll--the models you see when your character dies in a game--when you were killed. In the company's example, dying in Team Fortress 2 resulted in a dummy remote access Trojan being installed on your system.
Así que no se preocupen amigos, ya pueden morir en estos juegos sin temor a recibir un "regalo" extra (aparte de ser humillados en el juego).