GHSA-24C8-4792-22HX Scriban: array.insert_at index parameter DoS bypasses LoopLimit and LimitToString

Summary ArrayFunctions.InsertAt in Scriban allocates index - list.Count null entries in a tight C for loop with no bound on index. The function is exposed to template authors as array.insertat, and the fill loop ignores every existing safety control: LoopLimit, LimitToString, ObjectRecursionLimit...