CVE-2026-122305

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{"bugzilla": {"description": "github.com/kyverno/kyverno: Kyverno: Denial of Service via unbounded variable substitution loop", "id": "2567489", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567489"}, "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-835", "details": ["Kyverno before 1.19.2 contains a denial of service vulnerability in substituteVariablesIfAny that allows low-privileged users to hang the admission webhook via self-referential variable templates. Attackers can create resources whose annotations re-introduce the embedded policy variable, causing unbounded substitution loops that exhaust CPU and memory and block cluster-wide admission.", "A flaw was found in Kyverno. An authenticated user with low privileges can trigger a Denial of Service (DoS) by submitting resources containing self-referential variable templates within annotations. When processing these annotations, Kyverno enters an unbounded substitution loop that exhausts system memory and processor resources. This condition causes the admission webhook to become unresponsive, blocking admission requests across the entire 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-2026-122305", "public_date": "2026-11-05T02:25:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-122305\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-122305\nhttps://github.com/kyverno/kyverno/security/advisories/GHSA-338x-hgrv-626h\nhttps://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-nested-variable-substitution-loop"], "statement": "This vulnerability is rated as Important because an authenticated user with minimal namespace-level privileges can disrupt cluster-wide operations. When Kyverno evaluates policy rules against incoming manifests with recursively nested variable references, the admission controller enters a continuous processing loop that depletes available host compute and memory resources. In multi-tenant environments, an unresponsive validating or mutating webhook stalls subsequent API admission requests across unrelated projects, escalating a localized object submission into a widespread platform outage.", "threat_severity": "Important"}

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