{
  "id": "CVE-2026-124440",
  "url": "https://spydr.io/cve/CVE-2026-124440",
  "published": "2026-11-08T14:18:10.633Z",
  "modified": "2026-11-08T14:18:10.633Z",
  "score": 9.4,
  "severity": "critical",
  "cvss_version": "4.0",
  "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
  "score_source": "vulncheck.com",
  "epss": null,
  "epss_percentile": null,
  "exploited": false,
  "kev": null,
  "ssvc_exploitation": null,
  "vendors": [
    "kyverno"
  ],
  "products": [
    "kyverno"
  ],
  "cwes": [
    "CWE-441"
  ],
  "description": "Kyverno from 1.19.1 before 1.19.2 contains an authorization bypass vulnerability in the apiCall namespace clamp that allows namespace tenants to issue cross-namespace and cluster-scoped API requests by appending malformed percent-escapes to urlPath. Attackers can create namespaced Policies whose apiCall runs as the admission-controller ServiceAccount to read other namespaces' resources and create mutating webhooks, escalating to cluster admin.",
  "status": "Received",
  "score_type": "Secondary",
  "scores": {
    "cvss_v40": 9.4,
    "cvss_v31": 9.9,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://github.com/kyverno/kyverno/security/advisories/GHSA-39w8-hv5g-f73w",
      "tags": []
    },
    {
      "url": "https://www.vulncheck.com/advisories/kyverno-1.19.1-privilege-escalation-via-apicall-namespace-clamp-bypass",
      "tags": []
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124440",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}