In our project, Snyk reported `rc@1.2.6` as a dependency with a known security vulnerability, because it depends on `deep-extend@0.4.2`. The latest version of rc (1.2.7) fixed this vulnerability. More info about the (low priority) vulnerability in `deep-extend@0.4.2` can be found at https://snyk.io/vuln/npm:deep-extend:20180409