Is it possible in nginx to rise above the document root via the request URI?

Question

Nginx

nginx.org/ru/docs/http/ngx_http_core_module.html#v...

$request_filename
path to the file for the current request, formed from the root or alias directives and the request URI

And if a URI like '/../../../etc'. Does nginx take this into account by limiting the request to the document root?
Would such a design be safe?

root /home/sergey/www;
location / {
    try_files $uri $uri/ =404;
}
location ~ \.lua$ {
    default_type text/html;
    content_by_lua_file $request_filename;
}

Answer 1

Safely. You can't rise above root by specifying "../" in a URI.