{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.0.0-beta.4"
              },
              {
                "last_affected": "1.0.0-beta.4"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "dcbffb084f9a85b7362f2c146e16f749d2c81179"
            },
            {
              "last_affected": "dcbffb084f9a85b7362f2c146e16f749d2c81179"
            }
          ],
          "repo": "https://github.com/rustfs/rustfs",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.0.0-beta.4"
      ]
    }
  ],
  "aliases": [
    "GHSA-f4vq-9ffr-m8m3"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22",
      "CWE-862"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49991.json"
  },
  "details": "RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries.",
  "id": "CVE-2026-49991",
  "modified": "2026-07-15T01:49:07.886687246Z",
  "published": "2026-06-26T20:01:29.896Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49991.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49991"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection"
}