CVE-2026-122267

{
  "etk_id": "ETK-2026-3673",
  "cve_id": "CVE-2026-122267",
  "display_id": "CVE-2026-122267",
  "ghsa_id": "GHSA-48rv-pgqh-mhjg",
  "euvd_id": "EUVD-2026-117823",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Signature verification flaw in Chainguard MinIO",
  "summary": "Chainguard MinIO releases before RELEASE.2026-09-22T19-25-18Z have an AWS Signature Version 4 verification flaw. An attacker with a presigned PUT URL may be able to expand its authorization and read data from a different bucket.",
  "mitigation": "Upgrade MinIO to RELEASE.2026-09-22T19-25-18Z or later. Until upgraded, restrict distribution and lifetime of presigned PUT URLs.",
  "vendor": "Chainguard",
  "product": "MinIO",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= RELEASE.2026-09-21T00-15-41Z"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "RELEASE.2026-09-22T19-25-18Z"
      ],
      "package_name": "github.com/chainguard-forks/minio",
      "purl": "pkg:golang/github.com/chainguard-forks/minio"
    }
  ],
  "cwes": [
    347
  ],
  "cvss_score": 8.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 12.597917616666667,
  "t0_at": "2026-11-05T22:00:11.719000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-05T22:00:11.719000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-05T22:00:11.719000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-122267"
    }
  }
}