Lesson: Distrust Input

Is this an example of the distrust your inputs lesson?

An important mantra of secure software engineering is: don't trust your inputs. These are vulnerabilities where the fix involved improving the way input was handled as it went into the system.

We must note that robust input handling is a fantastic mitigation strategy, but often is incomplete. In the interest of Defense in Depth, developers ought to consider attempting to secure their own code as well as handle inputs.