MinIO performs incomplete signature validation for unsigned-trailer uploads

{
  "id": "d30721b7c0cdad30eecf6bbc50ce75aa796e4cdbec227e7f933685c1747d1e5d",
  "url": "https://osv.dev/vulnerability/BIT-minio-2025-31489",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "MinIO performs incomplete signature validation for unsigned-trailer uploads",
    "summary": "MinIO is a High Performance Object Storage released under GNU Affero General Public License v3.0. The signature component of the authorization may be invalid, which would mean that as a client you can use any arbitrary secret to upload objects given the user already has prior WRITE permissions on the bucket. Prior knowledge of access-key, and bucket name this user might have access to - and an access-key with a WRITE permissions is necessary. However with relevant information in place, uploading random objects to buckets is trivial and easy via curl. This issue is fixed in RELEASE.2025-04-03T14-56-28Z.",
    "evidence": "osv:BIT-minio-2025-31489",
    "products": [
      {
        "name": {
          "value": "minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2023.12.23",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "BIT-minio-2025-31489",
      "aliases": [
        "BIT-minio-2025-31489"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2023.12.23"
                }
              ]
            }
          ],
          "package": {
            "name": "minio",
            "purl": "pkg:bitnami/minio",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V4",
              "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/minio/BIT-minio-2025-31489.json"
          }
        }
      ],
      "modified": "2026-10-08T08:11:02.807048475Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/pull/21103",
        "https://github.com/minio/minio/security/advisories/GHSA-wg47-6jq2-q2hh",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-31489"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:minio:minio:*:*:*:*:*:go:*:*"
        ],
        "severity": "High"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 98789,
  "published_at": "2025-04-14T11:14:54.951+00:00"
}