About Remote Code Execution – Kubernetes (CVE-2025-1974) vulnerability. An unauthenticated attacker with access to the pod network can achieve arbitrary code execution in the context of the ingress-nginx controller. This can lead to disclosure of Secrets accessible to the controller. In the default installation, the controller can access all Secrets cluster-wide.
On March 24, Wiz published a write-up on this vulnerability, naming it IngressNightmare (alongside CVE-2025-1097, CVE-2025-1098, and CVE-2025-24514). Wiz researchers identified 6,500 vulnerable controllers exposed to the Internet. 
The Kubernetes blog reports that in many common scenarios, the Pod network is accessible to all workloads in the cloud VPC, or even anyone connected to the corporate network. Ingress-nginx is used in 40% of Kubernetes clusters.
Public exploits are available on GitHub since March 25th. 
Update ingress-nginx to versions v1.12.1, v1.11.5, or higher!