Unverified access point ownership in Amazon EFS CSI Driver

UnratedCVE-2026-85781 · Published Sep 4, 2026 · updated Sep 9, 2026

Bulletin ID: 2026-099-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/04/2026 11:45 AM PDT Description: The Amazon EFS CSI Driver is an open-source Kubernetes Container Storage Interface (CSI) driver that lets Kubernetes workloads use Amazon EFS file systems. We identified CVE-2026-85781, an issue in the driver's volume-deletion logic. When the controller is configured with the non-default --delete-access-point-root-dir=true option, it did not verify that the EFS access point referenced by a PersistentVolume's volume handle belonged to the file system referenced by that same volume handle. An authenticated Kubernetes user with permission to create PersistentVolumes could use a crafted volume handle to cause the controller to recursively delete directories from an Amazon EFS file system that the user was not otherwise authorized to modify. This issue does not affect Amazon EFS itself; Amazon EFS access controls operated as designed. Impacted versions: <=3.4.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.