kin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas missing items

{
  "id": "b1cd36e872c05853ff201298cd4ebaa7de5832b3b17af4020f4f7ddfd724954e",
  "url": "https://osv.dev/vulnerability/CVE-2026-97394",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "kin-openapi: Nil-pointer dereference panic in openapi3filter for OpenAPI 3.1 array schemas missing items",
    "summary": "kin-openapi is a Go project for handling OpenAPI files. From 0.136.0 until 0.143.0, openapi3filter accepts OpenAPI 3.1 array schemas without an items keyword and then dereferences the nil Schema.Items value while decoding application/x-www-form-urlencoded or multipart/form-data request bodies, response headers, and other array parameter surfaces. A remote unauthenticated client can reach an affected operation with a nonempty request or matching response and deterministically trigger a nil-pointer panic during ValidateRequest or ValidateResponse. OpenAPI 3.0 documents are not affected because document validation rejects arrays without items, and JSON request bodies use a different decoder path. This issue is fixed in version 0.143.0.",
    "evidence": "osv:CVE-2026-97394",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-97394",
      "aliases": [
        "CVE-2026-97394",
        "GHSA-p6wj-qrr4-pgh5"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/getkin/kin-openapi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ff4bce724cfa3fdf6fac4470c76a8511662b21f6"
                },
                {
                  "fixed": "30e292371a89ca6d1f91a9553e0aa518b49f838d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.136.0"
                      },
                      {
                        "fixed": "0.143.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "30e292371a89ca6d1f91a9553e0aa518b49f838d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "30e292371a89ca6d1f91a9553e0aa518b49f838d"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.143.0"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.143.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.142.0",
            "v0.141.0",
            "v0.140.0",
            "v0.139.0",
            "v0.138.0",
            "v0.137.0",
            "v0.136.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97394.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.828885456Z",
      "provider": "osv",
      "references": [
        "https://github.com/getkin/kin-openapi/releases/tag/v0.143.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97394.json",
        "https://github.com/getkin/kin-openapi/security/advisories/GHSA-p6wj-qrr4-pgh5",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-97394",
        "https://github.com/getkin/kin-openapi/commit/30e292371a89ca6d1f91a9553e0aa518b49f838d",
        "https://github.com/opnsense/core/security/advisories/GHSA-26cj-h9rj-g5pf"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-248",
          "CWE-476"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97394.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-97394",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500108,
  "published_at": "2026-10-15T15:29:05.238+00:00"
}