Affected: Go: github.com/kyverno/kyverno

### Impact

In versions of Kyverno prior to 1.10.0, resources which have the `deletionTimestamp` field defined can bypass validate, generate, or mutate-existing policies, even in cases where the `validationFailureAction` field is set to `Enforce`.

This situation occurs as resources pending deletion were being consciously exempted by Kyverno, as a way to reduce processing load as policies are typically not applied to objects which are being deleted.

However, this could potentially result in allowing a malicious user to leverage the [Kubernetes finalizers feature](https://kubernetes.io/docs/concepts/overview/working-with-objects/finalizers/) by setting a finalizer which causes the Kubernetes API server to set the `deletionTimestamp` and then not completing the delete operation as a way to explicitly to bypass a Kyverno policy.

Note that this is not applicable to Kubernetes Pods but, as an example, a Kubernetes Service resource can be manipulated using an indefinite finalizer to bypass policies.

### Patches This is resolved in Kyverno 1.10.0.

### Workarounds There is no known workaround.

### References _Are there any links users can visit to find out more?_