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Fencer Vulns
medium 5.9

CVE-2026-2270 json

StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation

published 2026-10-26 13 d ago modified 2026-10-29 10 d ago also EUVD-2026-110501

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

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.

Patch / fix

  • kubernetes Debian 14, Debian 13, Debian 12 1.20.5+really1.20.2-1

debian advisories DEBIAN-CVE-2026-2270

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-2270 updated cvss 5.9

kube-controller-manager: kube-controller-manager: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation

  • Red Hat Logical Volume Manager Storage lvms4/lvms-rhel9-operator, lvms4/lvms-operator-bundle, lvms4/lvms-must-gather-rhel9 Red Hat Advanced Cluster Management for Kubernetes 2 flightctl, flightctl-agent, flightctl-selinux Red Hat Edge Manager 1 flightctl Red Hat Hardened Images kubernetes1.35, kubernetes1.36 Red Hat OpenShift Container Platform 4 cri-tools, openshift, microshift, microshift-olm, kata-containers, microshift-sriov, +38 more Red Hat OpenShift Container Platform 5 cri-tools, openshift, microshift, openshift5/ose-hyperkube-rhel9, openshift5/microshift-bootc-rhel9, openshift5/microshift-bootc-rhel10, +2 more
    +1 more products
    Red Hat OpenShift GitOps microshift-gitops, openshift-gitops-argocd-cli
    affected: workaround, no fix available “Do not grant create/update/patch on ControllerRevision to users or service accounts that only need to manage StatefulSets.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
10 d ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Kubernetes Kubernetes

Classification

Weakness
  • CWE-639 Authorization Bypass Through User-Controlled Key
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.