Description
A confused deputy attack exists in the StatefulSet controller that allows a user with namespace-scoped write permissions on StatefulSet and ControllerRevision objects to create a cross-namespace pod. An attacker exploiting this vulnerability would have full control over the resulting pod’s metadata and specification, including namespace selection. Note that the cross-namespace pod will be immediately deleted by the garbage collector unless the attacker is able to construct a valid StatefulSet OwnerReference. This would require referencing the UID of an existing StatefulSet in the victim’s namespace.
Published: 2026-10-26
Score: 5.9 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

Vendor Solution

To mitigate this vulnerability, upgrade Kubernetes: https://kubernetes.io/docs/tasks/administer-cluster/cluster-upgrade/

Tracking

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Advisories

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History

Tue, 27 Oct 2026 05:30:00 +0100

Type Values Removed Values Added
Description A flaw was found in Kubernetes kube-controller-manager. The StatefulSet controller restores ControllerRevision data onto the whole StatefulSet object, including metadata. A user with namespace-scoped write access to StatefulSet and ControllerRevision can cause the controller to create a pod in another namespace. That pod is deleted by garbage collection unless the attacker can name the UID of a StatefulSet in the target namespace. A confused deputy attack exists in the StatefulSet controller that allows a user with namespace-scoped write permissions on StatefulSet and ControllerRevision objects to create a cross-namespace pod. An attacker exploiting this vulnerability would have full control over the resulting pod’s metadata and specification, including namespace selection. Note that the cross-namespace pod will be immediately deleted by the garbage collector unless the attacker is able to construct a valid StatefulSet OwnerReference. This would require referencing the UID of an existing StatefulSet in the victim’s namespace.
Title kube-controller-manager: kube-controller-manager: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation
Weaknesses CWE-639
References

Tue, 29 Sep 2026 15:15:00 +0200

Type Values Removed Values Added
Description A flaw was found in Kubernetes kube-controller-manager. The StatefulSet controller restores ControllerRevision data onto the whole StatefulSet object, including metadata. A user with namespace-scoped write access to StatefulSet and ControllerRevision can cause the controller to create a pod in another namespace. That pod is deleted by garbage collection unless the attacker can name the UID of a StatefulSet in the target namespace.
Title kube-controller-manager: kube-controller-manager: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation
Weaknesses CWE-1220
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N'}

threat_severity

Moderate

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: kubernetes

Published:

Updated: 2026-10-26T23:10:06.624Z

Reserved: 2026-02-10T03:58:54.680Z

Link: CVE-2026-2270

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-26T23:17:00.010

Modified: 2026-10-27T00:17:19.210

Link: CVE-2026-2270

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-15T16:00:00Z

Links: CVE-2026-2270 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T03:30:17Z

Weaknesses
  • CWE-1220

    Insufficient Granularity of Access Control

  • CWE-639

    Authorization Bypass Through User-Controlled Key