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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.

PUBLISHED Reserved 2026-03-10 | Published 2026-03-20 | Updated 2026-03-23 | Assigner kubernetes




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CSI Driver for NFS path traversal via subDir may delete unintended directories on the NFS server

Problem types

CWE-22 Path Traversal

Product status

Default status
unaffected

Any version before 4.13.1
affected

4.13.1
unaffected

Credits

Shaul Ben Hai, Senior Staff Security Researcher, SentinelOne reporter

References

www.openwall.com/lists/oss-security/2026/03/17/1

groups.google.com/...ernetes-security-announce/c/i4ZKN9VLcUE mailing-list

github.com/kubernetes/kubernetes/issues/137797 issue-tracking

cve.org (CVE-2026-3864)

nvd.nist.gov (CVE-2026-3864)

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