That's just code, not a scenario. Government IT systems are currently subject to oversight, testing, comprehensive threat risk assessments etc. Those controls d

That's just code, not a scenario. Government IT systems are currently subject to oversight, testing, comprehensive threat risk assessments etc. Those controls don't disappear just because the software is open source. Right now it's not possible to just deploy new code, open source or not, into a production environment on a critical piece of infrastructure without review. If anything, the open source code should be significantly more secure, because you have added an additional layer of public review, testing and comment.