Unknown hackers have the source code of old versions of the ESX hypervisor of VMware captured. That the company has confirmed, after the source code on Pastebin was published. According to VMware is the leak no danger.
It would in any case go to old source code from 2003 or 2004. That would have been stolen by a Chinese company that is evidently about the VMware source code. According to VMware the company share more code with other companies. Previously published in hackers source code of pcAnywhere, the Symantec software.