Bug 2567835 (CVE-2026-122312)

Summary: CVE-2026-122312 github.com/kyverno/kyverno: Kyverno: Namespace isolation bypass via crafted APICall URL path
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. An authenticated user with permissions to create namespaced policies can bypass namespace isolation restrictions by supplying a specially crafted API call URL path containing query strings. Because the path validation mechanism improperly handles query characters, cluster-scoped requests can appear to target an allowed namespace. This flaw allows an attacker to access and read resources outside their assigned namespace, leading to unauthorized information disclosure.
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Description OSIDB Bzimport 2026-11-05 22:30:00 UTC 
Kyverno from 1.19.1 before 1.19.2 contains a namespace isolation bypass in APICall Fetch() in pkg/engine/apicall/apiCall.go because path.Clean treats '?' as a path character, letting the namespace regex match segments inside the query string. Users who can create namespaced policies can supply a URLPath like /api/v1/nodes?x=/namespaces/default/ that passes validation while client-go requests the cluster-scoped endpoint, reading resources outside their namespace.