How severe is CVE-2026-6437?

No CVSS score has been assigned to CVE-2026-6437 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-6437?

CVE-2026-6437 affects the following packages: github.com/kubernetes-sigs/aws-efs-csi-driver (Go). Ecosystems affected: Go.

How do I fix CVE-2026-6437?

Update github.com/kubernetes-sigs/aws-efs-csi-driver to 1.7.8-0.20260416142831-51806c22c575 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-6437 is resolved across your whole dependency graph.

How do I detect CVE-2026-6437 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/kubernetes-sigs/aws-efs-csi-driver, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-6437 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-6437 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-6437 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-6437?

CVE-2026-6437 has an EPSS (Exploit Prediction Scoring System) score of 0.6%, placing it in the 47th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-6437?

CVE-2026-6437 is classified as CWE-88 (CWE-88). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-6437 published, and has it been updated?

CVE-2026-6437 was published on April 17, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

CVE-2026-6437 — aws-efs-csi-driver

Fix: kubernetes-sigs/aws-efs-csi-driver@51806c2

CVE-2026-6437 is a CWE-88 vulnerability in github.com/kubernetes-sigs/aws-efs-csi-driver. A fix is available for github.com/kubernetes-sigs/aws-efs-csi-driver — see the affected versions and patch details below.

AWS EFS CSI Driver Mount Option Injection

Also known asGHSA-mph4-q2vm-w2pw

Published

Apr 17, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-6437.

EPSS Exploitation Probability

via FIRST.org ↗

0.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs47th percentile — riskier than 47% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐹github.com/kubernetes-sigs/aws-efs-csi-driver

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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 [email protected]. 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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/kubernetes-sigs/aws-efs-csi-driver`	all versions	1.7.8-0.20260416142831-51806c22c575`go get github.com/kubernetes-sigs/aws-efs-csi-driver@v1.7.8-0.20260416142831-51806c22c575`

Affected Products

1 product · 1 configurations

Application

efs csi driveramazon

< 3.0.1

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/kubernetes-sigs/aws-efs-csi-driver, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/kubernetes-sigs/aws-efs-csi-driver to 1.7.8-0.20260416142831-51806c22c575 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-6437 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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-separ

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