This indicates an attack attempt against a Parameter Injection Vulnerability in Google Talk.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling maliciously crafted links in the "gtalk://" uri handler. As a result, a remote attacker can exploit this to gain unauthorized access to sensitive information.
Google Talk 188.8.131.52
Google Talk 184.108.40.206
Information Disclosure: Remote attackers can gain sensitive information from vulnerable systems.
Currently we are not aware of any vendor supplied patch for this issue.