The libusb crate has not seen a release since September 2016, and its author is unresponsive.
libusb
The rusb crate is a maintained fork:
rusb
https://github.com/a1ien/rusb
{ "license": "CC0-1.0" }
{ "affects": { "functions": [], "os": [], "arch": [] }, "affected_functions": null }
{ "cvss": null, "categories": [], "informational": "unmaintained" }