CVE-2026-3864— CSI Driver for NFS path traversal via subDir may delete unintended directories on the NFS server
Quick assessment
Affected
Kubernetes CSI Driver for NFS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Kubernetes（K8s）是Kubernetes开源的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes（K8s）存在安全漏洞，该漏洞源于对volume identifiers中的subDir参数验证不足，可能导致攻击者通过路径遍历序列删除或修改NFS服务器上的目录。
Possible ATT&CK Techniques 1 AI
T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-3864
Vulnerability Information
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Vulnerability Title
CSI Driver for NFS path traversal via subDir may delete unintended directories on the NFS server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes（K8s） 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes（K8s）是Kubernetes开源的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes（K8s）存在安全漏洞，该漏洞源于对volume identifiers中的subDir参数验证不足，可能导致攻击者通过路径遍历序列删除或修改NFS服务器上的目录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Kubernetes | CSI Driver for NFS | 0 ~ 4.13.1 | - |
|
II. Public POCs for CVE-2026-3864
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-3864 (2)
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V. Comments for CVE-2026-3864
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