CVE-2026-6437 - Mount Option Injection in Amazon EFS CSI Driver

Bulletin ID: 2026-016-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/04/17 11:15 AM PDT Description: The Amazon EFS CSI Driver is a Container Storage Interface driver that allows Kubernetes clusters to use Amazon Elastic File System. We identified CVE-2026-6437, where an actor with PersistentVolume creation privileges can inject arbitrary mount options via two unsanitized fields: the Access Point ID in volumeHandle and the mounttargetip volumeAttribute. In both cases, appending comma-separated values causes the mount utility to parse them as separate mount options. No AWS service is affected. Impacted versions: EFS CSI Driver Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.