Not to sound mean, but why would that matter? This entire affair is a failure of Justice, failure of Quality Assurance, and failure of Outsourcing Governance.

It could have happened with any language and any hardware. The problems were people problems.

Side note: I'd hate to associate this affair with a particular software language, as it would just be media fodder, imagine headline: "Python Software Puts Proles in Prison"

The closest thing you'll find is probably the leaked auditors' report available here: https://drive.google.com/file/d/0Byzx9DpxFgFielpIaXU0OW1yZms... Unfortunately it's a scanned PDF without any apparent OCR.

Fujitsu/ICL made it. So whatever they use.