CVE-2026-122316

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{"bugzilla": {"description": "github.com/kyverno/kyverno: Kyverno: Unauthorized cross-namespace resource modification via mutate-existing background processor", "id": "2567870", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567870"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N", "status": "draft"}, "cwe": "CWE-639", "details": ["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.", "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."], "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-2026-122316", "public_date": "2026-11-05T02:25:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-122316\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-122316\nhttps://github.com/kyverno/kyverno/security/advisories/GHSA-vm98-8c25-h274\nhttps://www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-write-via-namespacedmutatingpolicy-mutateexisting"], "statement": "This vulnerability is rated as an Important impact because it permits authenticated tenants restricted to a single namespace to break multi-tenant isolation and modify cluster-scoped or foreign resources through the privileged background controller. Red Hat Enterprise Linux and OpenShift Container Platform do not ship Kyverno by default, significantly limiting exposure across standard deployments. Where this policy engine is deployed and non-admin users can define mutation rules, the risk is elevated because tenant boundaries can be bypassed to alter cluster-level security settings.", "threat_severity": "Important"}

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