FKIE_CVE-2026-77611

Vulnerability from fkie_nvd - Published: 2026-08-26 22:16 - Updated: 2026-08-27 17:20
Severity
7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Summary
SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler authorizes the request against the requested nested key but then writes the updated entry back to the bucket root rather than the key's actual parent directory, so an ACL change on allowed/protected.txt is instead applied to protected.txt at the bucket root. Because the update carries the full entry rather than only ACL metadata, an existing target object is overwritten with the content, metadata, owner information, and ACL of the scoped object, bypassing the object-level action scoping configured through the static S3 identity file. This issue is fixed in version 4.40.
References
security-advisories@github.comhttps://github.com/seaweedfs/seaweedfs/commit/311bc3a6dfbd042751692bc3de8accc516fcf8c1
security-advisories@github.comhttps://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-9x53-cjpr-m682
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-9x53-cjpr-m682
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "seaweedfs",
          "vendor": "seaweedfs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.40"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SeaweedFS is a distributed storage system for files and blobs. In versions prior to 4.40, an authenticated S3 principal with permissions scoped to a nested object key can overwrite a different object outside that scope by calling PutObjectAcl on the key it is allowed to access. The handler authorizes the request against the requested nested key but then writes the updated entry back to the bucket root rather than the key\u0027s actual parent directory, so an ACL change on allowed/protected.txt is instead applied to protected.txt at the bucket root. Because the update carries the full entry rather than only ACL metadata, an existing target object is overwritten with the content, metadata, owner information, and ACL of the scoped object, bypassing the object-level action scoping configured through the static S3 identity file. This issue is fixed in version 4.40."
    }
  ],
  "id": "CVE-2026-77611",
  "lastModified": "2026-08-27T17:20:24.790",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.1,
          "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:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77611",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-27T13:48:17.138303Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-26T22:16:30.007",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/seaweedfs/seaweedfs/commit/311bc3a6dfbd042751692bc3de8accc516fcf8c1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-9x53-cjpr-m682"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/seaweedfs/seaweedfs/security/advisories/GHSA-9x53-cjpr-m682"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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