CVE-2026-6437: Github.com/kubernetes sigs/aws efs csi driver Amazon EFS CSI Driver Has Vulnerability

MODERATE
Advisory Identifier: GHSA-mph4-q2vm-w2pw
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CVSS 6.5
CWE-88
Published
Advisory Summary

CVE-2026-6437 is a MODERATE (CVSS 6.5) amazon efs csi driver has vulnerability (CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')) affecting Github.com/kubernetes sigs/aws efs csi driver libraries in the Go ecosystem. The issue involves amazon efs csi driver has mount option injection via unsanitized volumehandle and mounttargetip fields. Remediation is available by upgrading affected packages to version 1.7.8-0.20260416142831-51806c22c575.

CVE-2026-6437 at a Glance

CVE Identifier CVE-2026-6437
GHSA Identifier GHSA-mph4-q2vm-w2pw
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected Product Github.com/kubernetes sigs/aws efs csi driver
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2026-6437

To remediate this vulnerability, upgrade all affected Github.com/kubernetes sigs/aws efs csi driver dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/kubernetes-sigs/aws-efs-csi-driver fixed: 1.7.8-0.20260416142831-51806c22c575 
Upgrade github.com/kubernetes-sigs/aws-efs-csi-driver to 1.7.8-0.20260416142831-51806c22c575
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/kubernetes-sigs/aws-efs-csi-driver

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-6437, inspect your project dependencies for Github.com/kubernetes sigs/aws efs csi driver:

inspect dependencies for github.com/kubernetes-sigs/aws-efs-csi-driver

Analyze the terminal output to locate any version of Github.com/kubernetes sigs/aws efs csi driver in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.7.8-0.20260416142831-51806c22c575), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection'), where the product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. In Github.com/kubernetes sigs/aws efs csi driver, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary The Amazon EFS CSI Driver is a Container Storage Interface driver that allows Kubernetes clusters to use Amazon Elastic File System. An issue exists where, under certain circumstances, unsanitized values in the volumeHandle and mounttargetip fields are passed directly to the mount command, allowing injection of arbitrary mount options. ### Impact An actor with PersistentVolume creation privileges can inject arbitrary mount options by appending comma-separated values to the Access Point ID in volumeHandle or to the mounttargetip volumeAttribute. The mount utility parses comma-separated values as separate options, causing the injected options to be applied to the filesystem mount without authorization. Impacted versions: <= v3.0.0 ### Patches This issue has been addressed in Amazon 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 If you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue. ### Acknowledgement We would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process.

CVE-2026-6437 Affected Github.com/kubernetes sigs/aws efs csi driver Versions

1 component(s)
Fixed Versions:
1.7.8-0.20260416142831-51806c22c575
Product / Package Ecosystem Affected Versions Fixed Version
github.com/kubernetes-sigs/aws-efs-csi-driver
golang/github.com/kubernetes-sigs/aws-efs-csi-driver
Go
< 1.7.8-0.20260416142831-51806c22c575
1.7.8-0.20260416142831-51806c22c575

References

GitHub Advisory / Wiki ADVISORY
https://github.com/kubernetes-sigs/aws-efs-csi-driver/security/advisories/GHSA-mph4-q2vm-w2pw
NVD — CVE-2026-6437 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6437
Security Fix Commit FIX COMMIT
https://github.com/kubernetes-sigs/aws-efs-csi-driver/commit/51806c22c5754bfbdeca6910f15571a07921b784
Github.com/kubernetes sigs/aws efs csi driver Security Information SECURITY
https://aws.amazon.com/security/security-bulletins/2026-016-aws
Github.com/kubernetes sigs/aws efs csi driver Source Repository REPOSITORY
https://github.com/kubernetes-sigs/aws-efs-csi-driver
Github.com/kubernetes sigs/aws efs csi driver Release RELEASE
https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.0.1

Frequently Asked Questions

What is CVE-2026-6437?
CVE-2026-6437 is a security vulnerability in Github.com/kubernetes sigs/aws efs csi driver involving Amazon EFS CSI Driver has mount option injection via unsanitized volumeHandle and mounttargetip fields under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection').
Which Github.com/kubernetes sigs/aws efs csi driver versions are affected?
Affected versions include releases prior to 1.7.8-0.20260416142831-51806c22c575 across affected packages: github.com/kubernetes-sigs/aws-efs-csi-driver.
What version fixes CVE-2026-6437?
Upgrading to 1.7.8-0.20260416142831-51806c22c575 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/kubernetes-sigs/aws-efs-csi-driver affected?
Yes, github.com/kubernetes-sigs/aws-efs-csi-driver is affected in releases prior to 1.7.8-0.20260416142831-51806c22c575. Upgrade your dependency to 1.7.8-0.20260416142831-51806c22c575 or later.
What is the CVSS score of CVE-2026-6437?
CVE-2026-6437 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-6437?
CVE-2026-6437 is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.).
How can I check Go dependencies for CVE-2026-6437?
Run the dependency tree command: 'inspect dependencies for github.com/kubernetes-sigs/aws-efs-csi-driver'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-mph4-q2vm-w2pw",
  "modified" : "2026-04-18T01:07:27Z",
  "published" : "2026-04-18T01:07:27Z",
  "aliases" : [ "CVE-2026-6437" ],
  "summary" : "Amazon EFS CSI Driver has mount option injection via unsanitized volumeHandle and mounttargetip fields",
  "details" : "### Summary\nThe Amazon EFS CSI Driver is a Container Storage Interface driver that allows Kubernetes clusters to use Amazon Elastic File System. An issue exists where, under certain circumstances, unsanitized values in the volumeHandle and mounttargetip fields are passed directly to the mount command, allowing injection of arbitrary mount options.\n\n### Impact\nAn actor with PersistentVolume creation privileges can inject arbitrary mount options by appending comma-separated values to the Access Point ID in volumeHandle or to the mounttargetip volumeAttribute. The mount utility parses comma-separated values as separate options, causing the injected options to be applied to the filesystem mount without authorization.\n\nImpacted versions: <= v3.0.0\n\n### Patches\nThis issue has been addressed in Amazon 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.\n\n### Workarounds\nRestrict PersistentVolume and StorageClass creation to cluster administrators using Kubernetes RBAC, preventing untrusted users from supplying arbitrary field values.\n\n### References\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com).  Please do not create a public GitHub issue.\n\n### Acknowledgement\nWe would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/kubernetes-sigs/aws-efs-csi-driver"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.7.8-0.20260416142831-51806c22c575"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes-sigs/aws-efs-csi-driver/security/advisories/GHSA-mph4-q2vm-w2pw"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6437"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes-sigs/aws-efs-csi-driver/commit/51806c22c5754bfbdeca6910f15571a07921b784"
  }, {
    "type" : "WEB",
    "url" : "https://aws.amazon.com/security/security-bulletins/2026-016-aws"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kubernetes-sigs/aws-efs-csi-driver"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.0.1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-88" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-18T01:07:27Z",
    "nvd_published_at" : "2026-04-17T19:16:40Z"
  }
}