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CVE-2026-3865 is a path traversal vulnerability in the Kubernetes CSI Driver for SMB. The flaw is caused by insufficient validation of the attacker-controlled subDir component embedded in the PersistentVolume volumeHandle used by the SMB CSI driver. The driver treated the volume identifier as a composite string, parsed the subdirectory field from it, and used path-joining logic to construct filesystem paths for operations on the backing SMB share without ensuring the resolved path remained confined to the intended managed subdirectory. By supplying traversal sequences in the volumeHandle, an attacker with permission to create PersistentVolume objects could cause the driver to escape the designated storage boundary. The vulnerable behavior is particularly exposed during cleanup and deletion workflows, where the driver may operate on unintended directories on the SMB server. Affected versions are CSI Driver for SMB releases prior to v1.20.1.
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A path-traversal vulnerability in the Kubernetes SMB CSI driver where crafted identifier fields can be parsed into filesystem paths outside the intended storage boundary.
A path traversal / boundary validation flaw in the Kubernetes CSI Driver for SMB that allows manipulated volumeHandle values to escape the intended storage subdirectory and access the wider filesystem.
A path traversal vulnerability in the Kubernetes CSI Driver for SMB (csi-driver-smb) caused by unsafe use of attacker-controlled subDir data from volumeHandle with filepath.Join, enabling escape from the intended tenant subdirectory into sibling tenant data.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.