octo-sts is a GitHub App that acts like a Security Token Service (STS) for the Github API. This vulnerability can spike the resource utilization of the STS service, and combined with a significant traffic volume could potentially lead to a denial of service. This vulnerability is fixed in 0.1.0
https://github.com/octo-sts/app/security/advisories/GHSA-75r6-6jg8-pfcq
https://github.com/octo-sts/app/commit/74ba874c017cf973edd6711144cf4399a9fcff57