# CVE-2026-2270: StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation

CVE-2026-2270 is fixed in kubernetes on 1 platform, first by DEBIAN-CVE-2026-2270, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-2270
- Priority: Routine
- CVSS: 5.9 (Moderate)
- EPSS: 0.0034
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 26, 2026
- Weakness: Authorization Bypass Through User-Controlled Key
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-2270

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kubernetes Debian 12.15 (bookworm) | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2026-2270](https://patchblox.com/security/data/fix/linux/debian-cve-2026-2270.md) | Sep 24, 2026 |
| Linux | kubernetes Debian 13.5 (trixie) | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2026-2270](https://patchblox.com/security/data/fix/linux/debian-cve-2026-2270.md) | Sep 24, 2026 |
| Linux | kubernetes Debian 14 | 1.20.5+really1.20.2-1 | [DEBIAN-CVE-2026-2270](https://patchblox.com/security/data/fix/linux/debian-cve-2026-2270.md) | Sep 24, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.