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{"bugzilla": {"description": "github.com/kyverno/kyverno: Kyverno: Namespace isolation bypass via crafted APICall URL path", "id": "2567835", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567835"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-551", "details": ["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.", "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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-122312", "public_date": "2026-11-05T02:25:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-122312\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-122312\nhttps://github.com/kyverno/kyverno/commit/f67231def576eb0ad153dd8cbfc836908ab14c14\nhttps://github.com/kyverno/kyverno/security/advisories/GHSA-pcx2-xcq4-65vf\nhttps://www.vulncheck.com/advisories/kyverno-1.19.1-before-1.19.2-namespace-isolation-bypass-via-apicall-urlpath-query-string"], "statement": "This vulnerability is rated as Important severity because authenticated tenants with permissions to manage namespaced policies can break isolation boundaries and retrieve cluster-scoped or cross-namespace resources. Although exploitation requires existing privileges to create policy resources, the flaw compromises the integrity of multi-tenant environments by allowing unauthorized read access via the controller's elevated API privileges. Red Hat OpenShift and other Red Hat offerings do not include or distribute Kyverno by default.", "threat_severity": "Important"}