CVE-2026-6437: AWS EFS CSI Driver Mount Option Injection

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-17 · updated 2026-10-26
Weakness: CWE-88

Description

Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection. To remediate this issue, users should upgrade to version v3.0.1

Affected products

Amazon AWS EFS CSI Driver: before 3.0.1 — fixed in 3.0.1

How to fix

Upgrade to a fixed version: Amazon AWS EFS CSI Driver 3.0.1. Check the vendor advisory for mitigations.

References

https://aws.amazon.com/security/security-bulletins/2026-016-aws/
https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.0.1
https://github.com/kubernetes-sigs/aws-efs-csi-driver/security/advisories/GHSA-mph4-q2vm-w2pw

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