CVE-2026-122314

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{"bugzilla": {"description": "github.com/kyverno/kyverno: Kyverno: Denial of Service via unchecked type assertion in variable substitution", "id": "2567833", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567833"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1287", "details": ["Kyverno before 1.19.2 contains an unchecked type assertion in its variable-substitution engine that allows users who can submit resources to crash the policy engine. Attackers can submit resources with non-string fields referenced by {{- variable }} shallow substitution in policies, causing a panic that yields webhook denial of service and policy bypass under failurePolicy Ignore.", "A flaw was found in Kyverno. An attacker authorized to submit resources can cause a Denial of Service (DoS) by providing unexpected non-string data in fields evaluated by policy variable substitutions. Because the variable-substitution engine fails to properly verify data types, processing this input causes the admission webhook to crash. This disruption halts policy enforcement and may allow unauthorized resources to bypass security controls if the system is configured to ignore failures."], "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-2026-122314", "public_date": "2026-11-05T02:25:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-122314\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-122314\nhttps://github.com/kyverno/kyverno/security/advisories/GHSA-x4xq-p8g4-6fwg\nhttps://www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-shallow-variable-substitution-panic"], "statement": "This vulnerability is rated as having a Moderate impact because successful exploitation requires an authenticated actor with privileges to create or alter resources within the cluster, restricting the overall blast radius to internal tenants. In standard deployments, the admission controller panics upon handling unexpected data types within policy variables, resulting in a temporary service outage. While an outage can lead to policy checks being skipped if admission rules are explicitly configured to ignore failures, it does not directly expose sensitive data or facilitate arbitrary code execution.", "threat_severity": "Moderate"}

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