CVE-2026-122306

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{"bugzilla": {"description": "github.com/kyverno/kyverno: Kyverno: Denial of Service via crafted policy wildcard patterns", "id": "2567602", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567602"}, "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:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespaced policy authors to exhaust admission controller CPU by submitting pathological wildcard patterns. Attackers can create a Policy with crafted match and exclude names evaluated by ValidateMatchExcludeConflict, pinning cores and causing cluster-wide webhook timeouts that block resource operations.", "A flaw was found in Kyverno. An authenticated attacker with policy creation privileges can cause a Denial of Service (DoS) by submitting policies containing crafted wildcard patterns. When evaluated, these complex patterns consume excessive processor resources, resulting in admission controller timeouts that block normal resource operations across the cluster."], "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-2026-122306", "public_date": "2026-11-05T02:25:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-122306\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-122306\nhttps://github.com/kyverno/kyverno/security/advisories/GHSA-8mrj-27wr-599g\nhttps://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-exponential-time-wildcard-matching"], "statement": "This vulnerability is rated as an Important severity impact because an authenticated user with permissions to define namespaced policies can exhaust admission controller CPU resources, escalating a localized action into a cluster-wide denial of service. When policy specifications incorporate conflicting or complex pattern-matching rules, the validation routine enters pathological computation cycles. As the admission webhook ceases responding in time, subsequent resource creation and mutation requests across the cluster fail due to webhook timeouts.", "threat_severity": "Important"}

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