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Fencer Intel
medium 5.9

CVE-2026-2270 json

StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation

published 14d ago modified 11d 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 kubernetes 1.34.12, 1.35.9, 1.36.5, 1.37.1
  • kubernetes Debian 14, Debian 13, Debian 12 1.20.5+really1.20.2-1

debian advisories DEBIAN-CVE-2026-2270

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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
11d ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.