I don't see a recursive option to go automatically search all *.yaml files in the current dir and sub dirs. I've also tried xargs but for some reason find . -name "*.yaml" | xargs kubesec scan is only returning this output, which is not correct because I get a proper report if I manually specify any one of the files that exist:

[
  {
    "object": "Unknown",
    "valid": false,
    "message": "This resource is invalid, Kubernetes kind not found",
    "score": 0,
    "scoring": {}
  },
  {
    "object": "Network/flannel.default",
    "valid": false,
    "message": "This resource is invalid, unknown schema",
    "score": 0,
    "scoring": {}
  }
]