MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads in github.com/minio/minio

{
  "id": "9556f46797692a07bb52d4170c6a94175409dbd26dda292aa494a5e44fd21628",
  "url": "https://osv.dev/vulnerability/GO-2026-5284",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads in github.com/minio/minio",
    "summary": "MinIO has an Unauthenticated Object Write via Missing Signature Verification in Unsigned-Trailer Uploads in github.com/minio/minio",
    "evidence": "osv:GO-2026-5284",
    "products": [
      {
        "name": {
          "value": "github.com/minio/minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "GO-2026-5284",
      "aliases": [
        "CVE-2026-40344",
        "GHSA-9c4q-hq6p-c237",
        "GO-2026-5284"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.0-20230506025312-76913a9fd5c6"
                }
              ]
            }
          ],
          "package": {
            "name": "github.com/minio/minio",
            "purl": "pkg:golang/github.com/minio/minio",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://vuln.go.dev/ID/GO-2026-5284.json"
          },
          "ecosystem_specific": {}
        }
      ],
      "modified": "2026-10-08T08:11:02.200052299Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/security/advisories/GHSA-9c4q-hq6p-c237",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40344",
        "https://github.com/minio/minio/commit/76913a9fd5c6e5c2dbd4e8c7faf56ed9e9e24091",
        "https://github.com/minio/minio/pull/16484"
      ],
      "provider_metadata": {
        "url": "https://pkg.go.dev/vuln/GO-2026-5284",
        "review_status": "UNREVIEWED"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40344",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 98766,
  "published_at": "2026-06-25T18:43:15+00:00"
}