Security advisory

{
  "id": "190657a6e3b8267801d3a43fa03b6596dfaf9053fe8f13a5160be13f3571fb2d",
  "url": "https://osv.dev/vulnerability/CVE-2026-73866",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-73866",
    "summary": "Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).",
    "evidence": "osv:CVE-2026-73866",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-73866",
      "aliases": [
        "CVE-2026-73866"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/helidon-io/helidon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e63e3d63f875f9c1f4e34d92375107f0b34d9d5c"
                },
                {
                  "last_affected": "e63e3d63f875f9c1f4e34d92375107f0b34d9d5c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:oracle:helidon:4.5.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.5.0"
                      },
                      {
                        "last_affected": "4.5.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73866.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.820765360Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73866.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73866",
        "https://www.oracle.com/security-alerts/cspuaug2026.html"
      ],
      "provider_metadata": {
        "cna_assigner": "oracle",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "4.0.0"
                  },
                  {
                    "last_affected": "4.4.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73866.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73866",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488269,
  "published_at": "2026-08-18T21:03:52.549+00:00"
}