Oracle Java SE — security advisory

{
  "id": "b8e68fb0957f9a543430c2176fab4c5e1cc2b10cd56e6dc41bc5f01803bdb6a5",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-87291",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-87291",
    "summary": "Vulnerability in Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Java SE accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).",
    "evidence": "cve:CVE-2026-87291",
    "products": [
      {
        "name": {
          "value": "Oracle Java SE",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-87291",
      "aliases": [
        "CVE-2026-87291"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "UNCHANGED",
            "version": "3.1",
            "baseScore": 5.3,
            "attackVector": "NETWORK",
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "NONE",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "LOW"
          }
        }
      ],
      "affected": [
        {
          "vendor": "Oracle Corporation",
          "product": "Oracle Java SE",
          "versions": [
            {
              "status": "affected",
              "version": "21.0.12.1"
            },
            {
              "status": "affected",
              "version": "25.0.4.1"
            },
            {
              "status": "affected",
              "version": "27"
            }
          ]
        }
      ],
      "modified": "2026-10-27T18:52:59.378Z",
      "provider": "cve",
      "references": [
        "https://www.oracle.com/security-alerts/cpuoct2026.html"
      ],
      "provider_metadata": {
        "adp": [
          {
            "title": "CISA ADP Vulnrichment",
            "metrics": [
              {
                "other": {
                  "type": "ssvc",
                  "content": {
                    "id": "CVE-2026-87291",
                    "role": "CISA Coordinator",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "version": "2.0.3",
                    "timestamp": "2026-10-27T18:52:31.288192Z"
                  }
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "lang": "en",
                    "type": "CWE",
                    "cweId": "CWE-287",
                    "description": "CWE-287 Improper Authentication"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP",
              "dateUpdated": "2026-10-27T18:52:59.378Z"
            }
          }
        ],
        "cna": {
          "orgId": "43595867-4340-4103-b7a2-9a5208d29a85",
          "shortName": "oracle",
          "dateUpdated": "2026-10-20T21:23:51.823Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-87291",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 398092,
  "published_at": "2026-10-20T21:23:51.823+00:00"
}