What’s Vulnerable › Vulnerabilities

CVE-2026-3864: CSI Driver for NFS path traversal via subDir may delete unintended directories on the NFS server

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-22

Description

A vulnerability was discovered in the Kubernetes CSI Driver for NFS where the subDir parameter in volume identifiers was insufficiently validated. Attackers with the ability to create PersistentVolumes referencing the NFS CSI driver could craft volume identifiers containing path traversal sequences (../). During volume deletion or cleanup operations, the driver could operate on unintended directories outside the intended managed path within the NFS export. This may lead to deletion or modification of directories on the NFS server.

Affected products

• Kubernetes CSI Driver for NFS: before 4.13.1 — fixed in 4.13.1

How to fix

Upgrade to a fixed version: Kubernetes CSI Driver for NFS 4.13.1. Check the vendor advisory for mitigations.

References

• https://github.com/kubernetes/kubernetes/issues/137797
• https://groups.google.com/g/kubernetes-security-announce/c/i4ZKN9VLcUE
• http://www.openwall.com/lists/oss-security/2026/03/17/1

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