Istio is an open platform to connect, manage, and secure microservices. In versions on the 1.15.x branch prior to 1.15.3, a user can impersonate any workload identity within the service mesh if they have localhost access to the Istiod control plane. Version 1.15.3 contains a patch for this issue. There are no known workarounds.

An uncontrolled resource consumption flaw was found in the Istio control plane, istiod. This issue could allow an unauthenticated remote attacker to send a specially crafted or oversized message that could cause a denial of service.