A software stack is the set of software layers and platforms that work together to make hardware usable. It can include low-level control code, operating systems, development tools, applications, and supporting services. In quantum computing, for example, hardware needs control software, programming frameworks, algorithms, and integration tools before it can support practical workloads.
Each layer can affect security: flaws or misconfigurations in one component may expose others, while dependencies can create supply-chain risks. Attackers may exploit vulnerable libraries, compromise build or update processes, or abuse weak interfaces between layers. Defenders map and update dependencies, restrict access, verify software sources, and test components across the stack. Evaluating the whole stack also helps organizations assess whether a platform is maintainable, resilient, and trustworthy-not just whether its hardware works.