> Allows a process to call execve(2). Coupled with the proc promise, this allows a process to fork and execute another program. If execpromises has been previously set the new program begins with those promises, unless setuid/setgid bits are set in which case execution is blocked with EACCES. Otherwise the new program starts running without pledge active, and hopefully makes a new pledge soon.

https://man.openbsd.org/pledge

Pledge can be inherited by child processes too.