A memory safety vulnerability is a bug that lets software read, write, or free memory in the wrong way. In practice, that can cause crashes, data leaks, or controlled corruption that attackers may turn into code execution. These flaws are especially serious in native code, where the program directly manages memory instead of relying on stronger runtime protections.
In cyber security, memory safety bugs matter because they often sit at parser boundaries: image loaders, JSON parsers, document renderers, and other components that process attacker-controlled input. If a server parses a malicious file through a vulnerable native library, malformed data can corrupt internal state and open an exploitation path. Defenders reduce this risk by patching quickly, limiting exposure of native dependencies, validating untrusted input, and isolating risky parsing tasks from higher-privilege services.