CVE-2026-6437
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 <&equal; v3.0.0 Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.
CSIRTS triage
- What
- An actor can inject arbitrary mount options via unsanitized fields.
- Who is affected
- Users with PersistentVolume creation privileges in Kubernetes clusters using the EFS CSI Driver.
- Urgency
- Remediation is important to prevent unauthorized mount option injection.
- Action
- Update to a version of the EFS CSI Driver above v3.0.0.
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Exploitation outlook
- Low exploitation risk0.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
Advisory coverage (1)
- unknownCVE-2026-6437 - Mount Option Injection in Amazon EFS CSI Driveraws · 2026-06-05
External references
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