CVE-2026-6437: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') in Amazon AWS EFS CSI Driver
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.
AI Analysis
Technical Summary
The vulnerability CVE-2026-6437 affects the AWS EFS CSI Driver versions prior to 3.0.1. It is caused by improper neutralization of argument delimiters (CWE-88) in the handling of volume mount options, allowing remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options. This can lead to argument injection attacks during volume mounting. The CVSS v3.1 score is 6.5, reflecting medium severity with high impact on confidentiality and integrity but no impact on availability. AWS, as the vendor of this cloud service, has released version 3.0.1 to remediate the issue and manages patching for this cloud-hosted service.
Potential Impact
Successful exploitation allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options, potentially compromising confidentiality and integrity of the system using the AWS EFS CSI Driver. There is no reported impact on availability. The medium CVSS score (6.5) reflects a moderate risk level.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service and has released version 3.0.1 of the AWS EFS CSI Driver to address this vulnerability. Users should ensure they are using version 3.0.1 or later. Since this is a cloud service, AWS typically applies necessary patches server-side; verify the vendor advisory at https://aws.amazon.com/security/security-bulletins/2026-016-aws/ for the latest remediation guidance.
CVE-2026-6437: CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') in Amazon AWS EFS CSI Driver
Description
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.
CVSS v3.1
Score 6.5medium
Affected software
Amazon
AWS EFS CSI Driver
pkg:github/kubernetes-sigs/aws-efs-csi-driverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-6437 affects the AWS EFS CSI Driver versions prior to 3.0.1. It is caused by improper neutralization of argument delimiters (CWE-88) in the handling of volume mount options, allowing remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options. This can lead to argument injection attacks during volume mounting. The CVSS v3.1 score is 6.5, reflecting medium severity with high impact on confidentiality and integrity but no impact on availability. AWS, as the vendor of this cloud service, has released version 3.0.1 to remediate the issue and manages patching for this cloud-hosted service.
Potential Impact
Successful exploitation allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options, potentially compromising confidentiality and integrity of the system using the AWS EFS CSI Driver. There is no reported impact on availability. The medium CVSS score (6.5) reflects a moderate risk level.
Mitigation Recommendations
AWS manages remediation for this cloud-hosted service and has released version 3.0.1 of the AWS EFS CSI Driver to address this vulnerability. Users should ensure they are using version 3.0.1 or later. Since this is a cloud service, AWS typically applies necessary patches server-side; verify the vendor advisory at https://aws.amazon.com/security/security-bulletins/2026-016-aws/ for the latest remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- AMZN
- Date Reserved
- 2026-04-16T17:42:09.910Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://aws.amazon.com/security/security-bulletins/2026-016-aws/","vendor":"AWS"}]
Threat ID: 69e28194bdfbbecc597b95e2
Added to database: 04/17/2026, 18:53:08 UTC
Last enriched: 06/05/2026, 19:27:40 UTC
Last updated: 09/14/2026, 22:01:36 UTC
Views: 206
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.