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.

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.