Bug 2541801 (CVE-2026-100707)

Summary: CVE-2026-100707 github.com/kyverno/kyverno: Kyverno: Namespace isolation bypass via percent-encoded path traversal
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. Inconsistent path validation allows an authenticated user with low privileges to bypass namespace isolation boundaries by using percent-encoded directory traversal sequences in policy API requests. An attacker can exploit this issue to access and read sensitive Kubernetes resources from unauthorized namespaces using the elevated permissions of Kyverno's service account.
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Description OSIDB Bzimport 2026-09-26 13:31:16 UTC 
Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.