Bug 2567870 (CVE-2026-122316)

Summary: CVE-2026-122316 github.com/kyverno/kyverno: Kyverno: Unauthorized cross-namespace resource modification via mutate-existing background processor
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: gbenhaim, niyer, twaugh
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Kyverno. A missing authorization check in the mutate-existing background processor allows an authenticated user with access to a specific namespace to modify resources outside their assigned boundary. By deploying a mutating policy that targets external resources, an attacker can cause the background controller to alter configurations or remove security controls cluster-wide.
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Description OSIDB Bzimport 2026-11-05 22:32:37 UTC 
Kyverno from 1.17.0 before 1.19.2 contains a missing authorization vulnerability in the mutate-existing background processor that allows namespaced tenants to modify resources outside their namespace. Attackers can create a NamespacedMutatingPolicy targeting Namespace objects or victim-namespace resources via CEL expressions, making the background-controller ServiceAccount strip Pod Security labels cluster-wide.