Stack-based buffer overflow in the IPureServer::_Recieve function in S.T.A.L.K.E.R.: Shadow of Chernobyl 1.0006 and earlier allows remote attackers to execute arbitrary code via a compressed 0x39 packet, which is decompressed by the NET_Compressor::Decompress function.
https://exchange.xforce.ibmcloud.com/vulnerabilities/43454
http://www.securityfocus.com/bid/29997
http://www.securityfocus.com/archive/1/493765