{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "19.0.0"
              },
              {
                "fixed": "19.2.6"
              },
              {
                "introduced": "20.0.0"
              },
              {
                "fixed": "20.2.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "1680e466aab77cdf9ba07394bea664106580b32b"
            },
            {
              "introduced": "048fc68c517f50b9978457f478ca4638f01caa09"
            },
            {
              "fixed": "f9fd95b4335bad6a26d7a74468f55d269e8dbef4"
            },
            {
              "fixed": "7f793731f1b39eb4f465e960113d2363c311b964"
            },
            {
              "fixed": "5837aa8e60471128dbb672b0ff6f1b1feebe08a7"
            },
            {
              "fixed": "5978c866d4a0812fbb024745c4f1e79aaecd6c6a"
            }
          ],
          "repo": "https://github.com/ceph/ceph",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-rmjq-ffrm-j6vj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54330.json"
  },
  "details": "Ceph is an open-source distributed storage platform providing object, block, and file storage. In versions prior to 20.2.4 and 19.2.6, the Ceph Object Gateway (RGW) SigV4 handler does not reject requests that carry x-amz-* headers absent from the signed header set, allowing anyone holding a presigned URL to attach arbitrary unsigned x-amz-* headers that RGW will honor. AWS S3 requires every x-amz-* header on a SigV4 request to be signed and rejects requests bearing additional unsigned headers, but RGW validates only the headers listed in X-Amz-SignedHeaders and ignores any extra ones, so they take effect without being covered by the signature. By adding such headers to a presigned PUT URL, an attacker can grant themselves more capabilities than the URL's signer intended and escalate their privileges. This issue is fixed in versions 20.2.4 and 19.2.6.",
  "id": "CVE-2026-54330",
  "modified": "2026-09-02T03:30:36.723420824Z",
  "published": "2026-08-27T20:59:24.688Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54330.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ceph/ceph/security/advisories/GHSA-rmjq-ffrm-j6vj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54330"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ceph/ceph/commit/5837aa8e60471128dbb672b0ff6f1b1feebe08a7"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ceph/ceph/commit/5978c866d4a0812fbb024745c4f1e79aaecd6c6a"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Ceph RGW SigV4 handler accepts unsigned x-amz-* headers on presigned requests, allowing privilege escalation"
}