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Developers nowadays have access to an arsenal of toolkits and libraries for rapid application prototyping. However, when an application loads a library, the entirety of that library’s code is mapped into the process address space, even if only a single function is actually needed. The unused portion is bloat that can negatively impact software defenses by unnecessarily inflating their overhead or increasing the attack surface. In this article, we investigate whether debloating is possible and practical at the binary level. To this end, we present Nibbler: a system that identifies and erases unused functions within dynamic shared libraries. Nibbler works in tandem with defenses such as continuous code re-randomization and control-flow integrity, enhancing them without incurring additional run-time overhead. We developed and tested a prototype of Nibbler on x86-64 Linux; Nibbler reduces the size of shared libraries and …