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

unknownCVE-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

vendor: Amazon product: EFS CSI DriverOtheraffected: <= v3.0.0

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.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: AWS Security Bulletins (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-06-05
Exploitation: Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-016-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-64370.42% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-6437	coverage & exploitation status	NVD · CVE.org

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