---
title: "VAST CSI Driver 2.6.6 Release Notes"
slug: "vast-csi-driver-2-6-6-release-notes-2-6"
updated: 2026-11-03T22:39:59Z
published: 2026-11-03T22:39:59Z
canonical: "docs.vastdata.com/vast-csi-driver-2-6-6-release-notes-2-6"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vastdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# VAST CSI Driver 2.6.6 Release Notes

VAST CSI Driver 2.6.6 is released to General Availability as of August 2026.

​To upgrade to VAST CSI Driver 2.6.6, follow the upgrade procedure in the ​​[*VAST CSI Driver 2.6 Administrator's Guid*e​​​](/develop/docs/csi-driver-administrators-guide-2-6).

## ​New Features

### ​​mTLS Support

​VAST CSI Driver supports mTLS authentication on client NFS connections to the VAST NFS server. In multi-tenant environments, mTLS authentication allows for certificate-based access control and isolation of workloads per storage class.

mTLS authentication for NFS requires VAST Cluster 5.5.0 or later.

​To use mTLS with the driver:

1. ​Configure the VAST cluster to use mTLS authentication of NFS, as described in the ​*VAST Cluster's Administrator's Guide*​​.
2. Add the client certificate and the private key to the Kubernetes secret that is used to supply the user's username and password:

```plaintext
  --from-file=mtls_client_cert=<certificate> \
  --from-file=mtls_client_privkey=<private key> \
```
3. Configure the storage class to mount with mTLS:

```plaintext
mountOptions:
    - "xprtsec=mtls"
```

## Enhancements

- ​VCSI-464: Added support for the ReadWriteOncePod (RWOP) access mode to the volumes.
- VCSI-358: Changed the default priority class for the VAST CSI node pod from ​system-cluster-critical​ to ​system-node-critical​​.

## ​​Resolved Issues

- VCSI-380: Resolved an issue that could cause an error when trying to modify a PVC with nested quotas.