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CVE-2026-82432

Estado: AplazadaAlta (8.1)—

Description

Nimbus validated `topology.blobstore.map` against the calling subject at submission time only. The rebalance operation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that validation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a blob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the blob's contents into the topology's working directory.

The same advisory covers `listBlobs`, which performed no authorization check and passed no subject, unlike the neighbouring `getBlobMeta` and `beginBlobDownload` operations.

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It therefore returned every key in the blobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the above practical. On its own the disclosure is metadata only.

Mitigation

Upgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time configuration is, against the rebalancing caller, and where `listBlobs` applies the configured authorization.

Users who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind that membership of a topology's `topology.users` or `topology.groups` confers them.

Credit

The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso remoto con privilegios (PR:L, AV:N) a Nimbus permite saltarse validación de ACL en rebalance para acceder a blobs no autorizados. listBlobs expone metadatos de claves sin autorización.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementApplication Developer GuidanceActive Directory ConfigurationVulnerability ScanningUser TrainingUser Account Management

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Apache — StormAI

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-82432",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-82432",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-14T20:03:04.876269Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Storm Nimbus",
          "versions": [
            {
              "status": "affected",
              "version": "3.0.0",
              "lessThan": "3.1.0",
              "versionType": "semver"
            }
          ],
          "packageName": "org.apache.storm:storm-server",
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-14T15:17:10.187",
  "references": [
    {
      "url": "https://lists.apache.org/thread/psy1gj77jhf9y3lhph9yz4f5fovmkz7b",
      "source": "security@apache.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/13/12",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Description\n\nNimbus validated `topology.blobstore.map` against the calling subject at submission time only. The rebalance\noperation accepts configuration overrides and stripped a small set of keys from them, but never re-ran that\nvalidation, so a caller authorised to rebalance a topology could introduce a blobstore map entry naming a\nblob whose ACL does not grant them access. Supervisors localise whatever key the map names, placing the\nblob's contents into the topology's working directory.\n\nThe same advisory covers `listBlobs`, which performed no authorization check and passed no subject, unlike\nthe neighbouring `getBlobMeta` and `beginBlobDownload` operations. It therefore returned every key in the\nblobstore to any caller able to reach the Nimbus Thrift port, which provides the key names that make the\nabove practical. On its own the disclosure is metadata only.\n\nMitigation\n\nUpgrade to 3.1.0, where rebalance configuration overrides are validated exactly as submission-time\nconfiguration is, against the rebalancing caller, and where `listBlobs` applies the configured\nauthorization.\n\nUsers who cannot upgrade immediately should restrict rebalance rights to trusted principals, keeping in mind\nthat membership of a topology's `topology.users` or `topology.groups` confers them.\n\nCredit\n\nThe ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm."
    }
  ],
  "lastModified": "2026-09-14T20:58:48.430",
  "sourceIdentifier": "security@apache.org"
}