Local Path Provisioner: HelperPod Template Injection

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Local Path Provisioner provides a way for the Kubernetes users to utilize the local storage in each node. Prior to 0.0.36, a malicious user with permission to edit the local-path-config ConfigMap in the local-path-storage namespace can manipulate the helperPod.yaml template used by rancher/local-path-provisioner. The helperPod.yaml template is loaded by the provisioner and used to create HelperPods during PVC provisioning and cleanup operations. However, the template is not sufficiently validated before use. Security-sensitive fields such as securityContext.privileged, hostPath volumes, and Linux capabilities can be injected into the template. When a PVC operation triggers HelperPod creation, the provisioner creates the HelperPod using the attacker-controlled template. This can result in a privileged pod running on the target node with the host root filesystem mounted. This may allow the attacker to access sensitive host files, read ServiceAccount tokens from other pods on the same node, access other tenants' local-path volume data, or modify files on the host node. This vulnerability is fixed in 0.0.36.

Source published

28 May 2026 16:41:35 UTC

Source modified

30 May 2026 01:59:56 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 8.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Local Path Provisioner provides a way for the Kubernetes users to utilize the local storage in each node. Prior to 0.0.36, a malicious user with permission to edit the local-path-config ConfigMap in the local-path-storage namespace can manipulate the helperPod.yaml template used by rancher/local-path-provisioner. The helperPod.yaml template is loaded by the provisioner and used to create HelperPods during PVC provisioning and cleanup operations. However, the template is not sufficiently validated before use. Security-sensitive fields such as securityContext.privileged, hostPath volumes, and Linux capabilities can be injected into the template. When a PVC operation triggers HelperPod creation, the provisioner creates the HelperPod using the attacker-controlled template. This can result in a privileged pod running on the target node with the host root filesystem mounted. This may allow the attacker to access sensitive host files, read ServiceAccount tokens from other pods on the same node, access other tenants' local-path volume data, or modify files on the host node. This vulnerability is fixed in 0.0.36.

Source published

28 May 2026 17:16:30 UTC

Source modified

26 Oct 2026 13:10:00 UTC

Observed here

27 Oct 2026 11:12:17 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 8.7 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

### Impact A malicious user with permission to edit the `local-path-config` ConfigMap in the `local-path-storage` namespace can manipulate the `helperPod.yaml` template used by `rancher/local-path-provisioner`. The `helperPod.yaml` template is loaded by the provisioner and used to create HelperPods during PVC provisioning and cleanup operations. However, the template is not sufficiently validated before use. Security-sensitive fields such as `securityContext.privileged`, `hostPath` volumes, and Linux capabilities can be injected into the template. Example malicious HelperPod template: ~~~yaml apiVersion: v1 kind: Pod metadata: name: helper-pod spec: containers: - name: helper-pod image: docker.io/kindest/local-path-helper:v20230510-486859a6 imagePullPolicy: IfNotPresent securityContext: privileged: true volumeMounts: - name: host-root mountPath: /host volumes: - name: host-root hostPath: path: / type: Directory ~~~ When a PVC operation triggers HelperPod creation, the provisioner creates the HelperPod using the attacker-controlled template. This can result in a privileged pod running on the target node with the host root filesystem mounted. This may allow the attacker to access sensitive host files, read ServiceAccount tokens from other pods on the same node, access other tenants' local-path volume data, or modify files on the host node. Expected Behavior: - The HelperPod template should not allow privileged containers. - The HelperPod template should not allow arbitrary `hostPath` mounts. - Security-sensitive fields in `helperPod.yaml` should be validated or rejected before the provisioner creates HelperPods. ### Patches This vulnerability is addressed by validating the HelperPod template loaded from the `local-path-config` ConfigMap before it is used to create HelperPods. The fix ensures that unsafe fields such as privileged security contexts, hostPath volumes, and other dangerous pod security settings are rejected. This prevents an attacker with ConfigMap edit permission from injecting a malicious HelperPod template that grants access to the host node. Previously, a malicious user could modify `helperPod.yaml` to cause the provisioner to create a privileged HelperPod with the host root filesystem mounted, potentially leading to node-level compromise and ServiceAccount token theft. With this fix, HelperPod templates containing unsafe security-sensitive fields are denied, and only safe HelperPod configurations are accepted. Patched versions of local-path-provisioner include releases v0.0.34 and later. No patches are provided for earlier releases, as they do not include the necessary HelperPod template validation logic. ### Workarounds Users should upgrade to a patched version of local-path-provisioner to fully mitigate this vulnerability. As a temporary mitigation, users can restrict write access to the `local-path-config` ConfigMap in the `local-path-storage` namespace. Only trusted administrators should be allowed to update this ConfigMap. Users may also mark the ConfigMap as immutable after deployment: ~~~bash kubectl -n local-path-storage patch configmap local-path-config \ --type merge -p '{"immutable": true}' ~~~ Additionally, enabling Kubernetes Pod Security Admission for the `local-path-storage` namespace can provide defense in depth. For example, enforcing the `baseline` policy can prevent privileged HelperPods from being created even if the template is modified: ~~~bash kubectl label namespace local-path-storage \ pod-security.kubernetes.io/enforce=baseline \ pod-security.kubernetes.io/warn=restricted ~~~ These mitigations reduce the risk of exploitation, but upgrading to a patched release is required to fully address the issue. ### References If you have any questions or comments about this advisory: - Contact the [SUSE Rancher Security team](https://github.com/rancher/rancher/security/policy) for security related inquiries. - Open an issue in the [Rancher](https://github.com/rancher/rancher/issues/new/choose) repository.

Source published

11 May 2026 16:15:48 UTC

Source modified

25 Jun 2026 19:56:16 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Publisher rating · HIGH

Local Path Provisioner Vulnerable to HelperPod Template Injection in github.com/rancher/local-path-provisioner

Source published

25 Jun 2026 18:43:15 UTC

Source modified

25 Jun 2026 19:45:20 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.