A sandbox escape is a cybersecurity event where malicious code or an attacker breaks out of a controlled, isolated environment called a sandbox. Sandboxes are used to safely run, test, or analyze untrusted programs without risking the rest of the system. When a sandbox escape occurs, the attacker gains unauthorized access to resources or data outside the sandbox, potentially compromising the entire system or network. This type of attack often exploits vulnerabilities in the sandbox's design or implementation, making it a serious threat for organizations relying on sandboxing for security.