{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.0.0"
                  },
                  {
                    "last_affected": "2.0.15"
                  }
                ],
                "source": "DESCRIPTION"
              },
              {
                "range": [
                  {
                    "introduced": "1.3.0"
                  },
                  {
                    "last_affected": "1.3.8"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          },
          "events": [
            {
              "introduced": "39c19afe4a3df7ea4fda778d82dc25bd494a110c"
            },
            {
              "last_affected": "1ac2db19bf68287b527d166128ab0d62d0d4097a"
            },
            {
              "introduced": "998746966815e1ae105cba9f2681d37cc30249bc"
            },
            {
              "last_affected": "8c61da2f325763f65214bdb4876641cbe31a2f0f"
            }
          ],
          "repo": "https://github.com/apache/tomcat-native",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "apache",
    "cwe_ids": [
      "CWE-366"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86247.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "range": [
              {
                "introduced": "2.0.0"
              },
              {
                "last_affected": "2.0.15"
              },
              {
                "introduced": "1.3.0"
              },
              {
                "last_affected": "1.3.8"
              }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
          }
        ]
      }
    ]
  },
  "details": "Race condition within a thread vulnerability in Apache Tomcat Native allowed client certificate verification requirements to be down-graded for some configurations.\n\n\n\nThis issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 2.0.16 or 1.3.9, which fixes the issue.",
  "id": "CVE-2026-86247",
  "modified": "2026-10-24T10:30:59.487864631Z",
  "published": "2026-09-23T12:31:53.210Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/23/33"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86247.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://lists.apache.org/thread/obsson6zhvfg0wsp2bx602l61ltj87r1"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86247"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache Tomcat Native: Client certificate requirements can be down-graded"
}