# \[Security Advisory\] CVE-2026-2270: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation

**URL:** https://discuss.kubernetes.io/t/security-advisory-cve-2026-2270-statefulset-and-controllerrevision-write-permissions-allow-cross-namespace-pod-creation/35276
**Category:** Announcements
**Created:** [September 23, 2026, 11:10pm UTC](https://discuss.kubernetes.io/t/security-advisory-cve-2026-2270-statefulset-and-controllerrevision-write-permissions-allow-cross-namespace-pod-creation/35276 "2026-09-23T23:10:09Z")
**Posts on this page:** 1
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### Author: ![Security\_k8s.io](https://avatars.discourse-cdn.com/v4/letter/s/da6949/32.png) [@Security\_k8s.io](https://discuss.kubernetes.io/u/Security_k8s.io)
#### Post date: [September 23, 2026, 11:10pm UTC](https://discuss.kubernetes.io/t/security-advisory-cve-2026-2270-statefulset-and-controllerrevision-write-permissions-allow-cross-namespace-pod-creation/35276/1 "2026-09-23T23:10:09Z")

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Hello Kubernetes Community,

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.

This issue has been rated Medium (5.9) [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N), and assigned CVE-2026-2270.

Affected Versions

- kube-controller-manager: \<= v1.34.11

- kube-controller-manager: \<= v1.35.8

- kube-controller-manager: \<= v1.36.4

- kube-controller-manager: = v1.37.0

How do I mitigate this vulnerability?

This issue can be mitigated by upgrading to a fixed kube-controller-manager version. The fixed versions are patched to ensure that only the spec field in StatefulSets will be restored from ControllerRevisions.

Fixed Versions

- kube-controller-manager: \>= v1.34.12

- kube-controller-manager: \>= v1.35.9

- kube-controller-manager: \>= v1.36.5

- kube-controller-manager: \>= v1.37.1

If you find evidence that this vulnerability has been exploited, please contact [security@kubernetes.io](mailto:security@kubernetes.io).

Additional Details

See the GitHub issue for more details: [CVE-2026-2270: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation · Issue #142097 · kubernetes/kubernetes · GitHub](https://github.com/kubernetes/kubernetes/issues/142097)

Acknowledgements

This vulnerability was reported by ImanOracle.

The issue was fixed and coordinated by:

Maciej Szulik @soltysh

Filip Křepinský @atiratree

Verónica López @Verolop

Jeremy Rickard @jeremyrickard

Nathan Herz @natherz97

Thank you,

Nathan Herz on behalf of the Kubernetes Security Response Committee