Path Traversal Vulnerability in Kubernetes CSI Driver for NFS

CVE-2026-3864

What is CVE-2026-3864?

CVE-2026-3864 is a significant vulnerability identified within the Kubernetes CSI Driver for NFS (Network File System), a critical component used for managing storage in Kubernetes environments. This vulnerability arises from inadequate validation of the subDir parameter in volume identifiers, allowing attackers with permissions to create PersistentVolumes to craft malicious volume identifiers. By inserting path traversal sequences (such as ../), these attackers can manipulate the operations of the CSI driver, particularly during volume deletion or cleanup. This could lead to unintended interactions with directories outside the controlled managed path on the NFS server, potentially causing unauthorized deletions or modifications of vital directories. The implications of this flaw are serious, as it threatens the integrity and availability of data stored within NFS exports, which are essential for many Kubernetes-based applications.

Potential impact of CVE-2026-3864

1. Data Loss and Corruption: Exploiting this vulnerability may result in unauthorized deletion or modification of files and directories on an NFS server, leading to critical data loss and corruption that can disrupt business operations.

2. Compromised System Integrity: The ability to manipulate directories can undermine the security posture of the affected environment, as attackers could potentially gain access to sensitive data or operational resources, weakening overall system integrity.

3. Service Disruption: Organizations relying on NFS for their Kubernetes deployments could experience significant service interruptions, as unintended changes or deletions could affect the functionality of applications relying on the storage systems, leading to downtime and resource wastage.

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