{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "rustfs",
          "vendor": "rustfs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0-alpha.56, \u003c 1.0.0-alpha.83"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.56 through 1.0.0-alpha.82, RustFS does not validate policy conditions in presigned POST uploads (PostObject), allowing attackers to bypass content-length-range, starts-with, and Content-Type constraints. This enables unauthorized file uploads exceeding size limits, uploads to arbitrary object keys, and content-type spoofing, potentially leading to storage exhaustion, unauthorized data access, and security bypasses. Version 1.0.0-alpha.83 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-25T02:10:28.086Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-w5fh-f8xh-5x3p"
        }
      ],
      "source": {
        "advisory": "GHSA-w5fh-f8xh-5x3p",
        "discovery": "UNKNOWN"
      },
      "title": "RustFS\u0027s Missing Post Policy Validation leads to Arbitrary Object Write"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27607",
    "datePublished": "2026-02-25T02:10:28.086Z",
    "dateReserved": "2026-02-20T19:43:14.602Z",
    "dateUpdated": "2026-02-25T02:10:28.086Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}