If you're looking for a chart, Wikipedia is keeping score:
https://en.wikipedia.org/wiki/LibreSSL#Security_and_vulnerab...
Whether this bug affects the upstream project is a legitimate concern, I think. It would be like worrying that a vulnerability in OpenBSD affected NetBSD, too, especially if it was found relatively close to when OpenBSD forked.
https://www.openssl.org/news/vulnerabilities.html