K8s StatefulSet Confused Deputy Enables CrossNamespace Pod Creation
CVE-2026-2270 Published on October 26, 2026
StatefulSet and ControllerRevision write permissions allow cross-namespace pod creation
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 pods 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 victims namespace.
Vulnerability Analysis
CVE-2026-2270 is exploitable with network access, and requires user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an Insecure Direct Object Reference / IDOR Vulnerability?
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.
CVE-2026-2270 has been classified to as an Insecure Direct Object Reference / IDOR vulnerability or weakness.
Products Associated with CVE-2026-2270
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Affected Versions
Kubernetes:- Version v1.34.0, <= v1.34.11 is affected.
- Version v1.35.0, <= v1.35.8 is affected.
- Version v1.36.0, <= v1.36.4 is affected.
- Version v1.37.0, <= v1.37.0 is affected.