Software Ages: Even the Best Code Isn't Forever

When software is built, it’s built on assumptions. Assumptions about the number of users, security needs, scalability, and more. Over time, all these factors change: users increase, expectations rise, security needs evolve, and scalability demands grow. As a result, reliability on old assumptions fails, causing software to age. One example is MongoDB’s recent vulnerability, which went unnoticed for eight years because the system trusted user input. This vulnerability, now known as MongoBleed, highlights how assumptions that once seemed safe can become liabilities over time.

As software grows in popularity, attackers often outpace defenders. People continuously look for ways to exploit software, whether to access premium features or gain recognition. If the same software were released today, it would likely be designed with a different mindset, taking into account a harsher and more hostile environment. Even then, software will eventually age, which is why it needs to be maintained according to the evolving ecosystem. Without maintenance, software becomes vulnerable to attacks, adding new features becomes more complex, and performance can degrade over time.

A real-world example of proactive evolution is Microsoft’s recent shift of parts of its codebase from C/C++ to Rust and Go. This transition helps them provide better security, patch vulnerabilities inherent in the old codebase, and sustain the software in a changing ecosystem. Maintenance is not a sign of software failure; rather, it is a sign that software still matters and remains relevant. By continuously updating to match current security threats, user expectations, and industry trends, software can sustain its usefulness over time.