ETK-2026-3640Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3640",
  "cve_id": null,
  "display_id": "ETK-2026-3640",
  "ghsa_id": "GHSA-3m3f-pjv4-x2fp",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unsigned S3 header injection in @supabase/storage-api",
  "summary": "@supabase/storage-api before 1.89.10 does not fully validate S3-specific headers on SigV4 presigned PUT requests. A recipient of such a URL may cause a copy operation using the presigning credential, potentially exposing objects that credential can access. Exploitation requires access to a presigned PUT URL issued by an affected deployment.",
  "mitigation": "Upgrade @supabase/storage-api to version 1.89.10 or later. Until upgrade, do not issue presigned PUT URLs to untrusted clients and limit the permissions of credentials used to create them.",
  "vendor": "npm",
  "product": "npm:@supabase/storage-api",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 1.89.9"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "1.89.10"
      ],
      "package_name": "@supabase/storage-api",
      "purl": "pkg:npm/@supabase/storage-api"
    }
  ],
  "cwes": [
    347
  ],
  "cvss_score": 7.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 10.881776166666667,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-11-05T14:38:14+00:00",
      "days": -0.18989178898148149,
      "is_lower_bound": true,
      "measured_at": "2026-11-05T19:11:40.688182+00:00",
      "url": "https://github.com/supabase/storage/security/advisories/GHSA-3m3f-pjv4-x2fp"
    },
    "trigger_signal": {
      "at": "2026-11-05T14:38:14+00:00",
      "days": -0.18989178898148149,
      "is_lower_bound": true,
      "measured_at": "2026-11-05T19:11:40.688182+00:00",
      "url": "https://github.com/supabase/storage/security/advisories/GHSA-3m3f-pjv4-x2fp"
    }
  }
}