A helper process is a secondary program that an application launches to do a specific job, such as updating routes, checking certificates, or calling an operating-system utility. In security-sensitive software, the main application often passes file paths, command-line arguments, and environment data to this helper, so correct quoting and path resolution are critical.
Helper processes matter because they create a trust boundary inside one product. If an attacker can influence how the helper is started, they may redirect execution to the wrong binary, inject unintended arguments, or trigger a privileged action in an unsafe location. Defenders look for signed binaries, fixed paths, careful argument escaping, and least-privilege design. In VPN software and similar tools, helper bugs can break service, weaken trust, or in some cases enable local privilege abuse.