MinIO performs incomplete signature validation for unsigned-trailer uploads

{
  "id": "82410b7dc40b48cae60d6331878450d5c47f889f0c188dfbbd2a2ec180c26d79",
  "url": "https://osv.dev/vulnerability/GHSA-wg47-6jq2-q2hh",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MinIO performs incomplete signature validation for unsigned-trailer uploads",
    "summary": "### Impact This is a high priority vulnerability and users must upgrade ASAP. 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` ### Patches Yes https://github.com/minio/minio/pull/21103 ### Workarounds Reject requests with `x-amz-content-sha256: STREAMING-UNSIGNED-PAYLOAD-TRAILER` for now at LB layer, ask application users to use `STREAMING-AWS4-HMAC-SHA256-PAYLOAD-TRAILER`",
    "evidence": "osv:GHSA-wg47-6jq2-q2hh",
    "products": [
      {
        "name": {
          "value": "github.com/minio/minio",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "0.0.0-20250403145552-8c70975283f9",
            "evidence": "/affected/0/ranges"
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        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-wg47-6jq2-q2hh",
      "aliases": [
        "CVE-2025-31489",
        "GHSA-wg47-6jq2-q2hh",
        "GO-2025-3594"
      ],
      "metrics": [
        {
          "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"
        }
      ],
      "affected": [
        {
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              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0.0.0-20250403145552-8c70975283f9"
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          "package": {
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            "purl": "pkg:golang/github.com/minio/minio",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/04/GHSA-wg47-6jq2-q2hh/GHSA-wg47-6jq2-q2hh.json"
          }
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      "modified": "2026-10-08T08:11:00.681228061Z",
      "provider": "osv",
      "references": [
        "https://github.com/minio/minio/security/advisories/GHSA-wg47-6jq2-q2hh",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-31489",
        "https://github.com/minio/minio/pull/21103",
        "https://github.com/minio/minio/commit/8c70975283f9f4ce80f331a25c7475a36279e519",
        "https://github.com/minio/minio"
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        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2025-04-03T20:15:25Z",
        "github_reviewed_at": "2025-04-04T14:28:29Z"
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    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 98743,
  "published_at": "2025-04-04T14:28:29+00:00"
}

{
  "id": "b7caccdde0dfed5735a830a028e5c749495bd6517b4f1e078ab361a27216376a",
  "url": "https://osv.dev/vulnerability/GO-2025-3594",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MinIO performs incomplete signature validation for unsigned-trailer uploads in github.com/minio/minio",
    "summary": "MinIO performs incomplete signature validation for unsigned-trailer uploads in github.com/minio/minio",
    "evidence": "osv:GO-2025-3594",
    "products": [
      {
        "name": {
          "value": "github.com/minio/minio",
          "evidence": "/affected/0/package/name"
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        "affected_versions": []
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    ],
    "severity": "unknown",
    "structured": {
      "id": "GO-2025-3594",
      "aliases": [
        "CVE-2025-31489",
        "GHSA-wg47-6jq2-q2hh",
        "GO-2025-3594"
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              "events": [
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          "package": {
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            "purl": "pkg:golang/github.com/minio/minio",
            "ecosystem": "Go"
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            "source": "https://vuln.go.dev/ID/GO-2025-3594.json"
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      "modified": "2026-10-08T08:11:00.681228061Z",
      "provider": "osv",
      "references": [
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        "https://nvd.nist.gov/vuln/detail/CVE-2025-31489",
        "https://github.com/minio/minio/commit/8c70975283f9f4ce80f331a25c7475a36279e519",
        "https://github.com/minio/minio/pull/21103"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 98746,
  "published_at": "2025-04-09T17:05:36+00:00"
}