Mount Option Injection in Amazon EFS CSI Driver

Bulletin ID: 2026-016-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 04/17/2026 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. Impacted versions:  EFS CSI Driver Resolution: This issue has been addressed in EFS CSI Driver version v3.0.1 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: Restrict PersistentVolume and StorageClass creation to cluster administrators using Kubernetes RBAC, preventing untrusted users from supplying arbitrary field values. References: CVE-2026-6437 GHSA-mph4-q2vm-w2pw Acknowledgement: We would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process. Please email aws-security@amazon.com with any security questions or concerns.   "},"metadata":{"tags":[]}},{"fields":{"patternBoolean2":"false","id":"ams#rt-rich-textc2#pattern-data"},"metadata":{"tags":[{"name":"pattern-data","description":"Default pattern data","id":"ams#rt-rich-textc2#pattern-data","namespaceId":"rt-rich-text"}]}}]},"metadata":{"auth":{},"testAttributes":{}},"context":{"page":{"pageUrl":"https://aws.amazon.com/security/security-bulletins/2026-016-aws/"},"contentType":"page","environment":{"stage":"prod","region":"us-west-2"},"sdkVersion":"2.0.27"},"refMap":{"manifest.js":"cda3e8d042","rt-rich-text.js":"5043b0a87f","rt-rich-text.rtl.css":"6a04028f86","rt-rich-text.css":"98f5a6aee4","rt-rich-text.css.js":"3d619cc2e1","rt-rich-text.rtl.css.js":"ccdb945d3e"},"settings":{"templateMappings":{"patternHeading":"patternHeading","patternSubheading":"patternSubheading","patternDark":"patternBoolean2","title":"itemHeading","bodyText":"itemLongLoc"}}} 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: 04/17/2026 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. Impacted versions:  EFS CSI Driver Resolution: This issue has been addressed in EFS CSI Driver version v3.0.1 . We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. Workarounds: Restrict PersistentVolume and StorageClass creation to cluster administrators using Kubernetes RBAC, preventing untrusted users from supplying arbitrary field values. References: CVE-2026-6437 GHSA-mph4-q2vm-w2pw Acknowledgement: We would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process. Please email aws-security@amazon.com with any security questions or concerns.   {"data":{"items":[{"fields":{"footer":"{ "createAccountButtonLabel": "Create an AWS account", "createAccountButtonURL": "https://signin.aws.amazon.com/signup?request_type=register", "backToTopText": "Back to top", "eoeText": "Amazon is an equal opportunity employer and does not discriminate on the basis of protected veter

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• aws.amazon.com/security/security-bulletins/rss/2026-016-aws/
• www.cve.org/CVERecord?id=CVE-2026-6437