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CVE-2026-82427

Estado: AplazadaAlta (7.8)—

Description

A topology's `topology.blobstore.map` lets the submitter choose a local name for each blob that the supervisor localises. That name was used to build a path under the topology's working directory without normalisation, in both `AsyncLocalizer` and `Container.createBlobstoreLinks`, and the symlink helper force-deletes whatever already exists at the target before creating the link.

A submitter could therefore use `../` segments to direct that delete-and-symlink operation at an arbitrary path, as the supervisor user, on every node the topology is scheduled onto.

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The consequences include recursive deletion of supervisor-owned content and planting a symlink that causes a subsequent worker launch to execute attacker-chosen code as another tenant's operating-system user, which defeats the isolation that `supervisor.run.worker.as.user` is intended to provide.

Mitigation

Upgrade to 3.1.0, where the resolved target must lie inside the expected root at both call sites.

Users who cannot upgrade immediately should restrict topology submission to trusted principals, and may reject submissions whose `topology.blobstore.map` entries contain path separators or `..` segments before they reach Nimbus.

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 local (AV:L) con privilegios (PR:L) sin interacción permite escalada mediante path traversal en blobstore, logrando eliminación arbitraria, plantación de symlinks maliciosos y ejecución de código como otro usuario.

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

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data Storage

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-2026-82427",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-82427",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-14T19:56:14.837455Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "2026-09-14T15:17:09.553",
  "references": [
    {
      "url": "https://lists.apache.org/thread/o0j51w6m0qdmwypvzfnd8w97s7ysnmyj",
      "source": "security@apache.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/13/7",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Description\n\nA topology's `topology.blobstore.map` lets the submitter choose a local name for each blob that the\nsupervisor localises. That name was used to build a path under the topology's working directory without\nnormalisation, in both `AsyncLocalizer` and `Container.createBlobstoreLinks`, and the symlink helper\nforce-deletes whatever already exists at the target before creating the link.\n\nA submitter could therefore use `../` segments to direct that delete-and-symlink operation at an arbitrary\npath, as the supervisor user, on every node the topology is scheduled onto. The consequences include\nrecursive deletion of supervisor-owned content and planting a symlink that causes a subsequent worker\nlaunch to execute attacker-chosen code as another tenant's operating-system user, which defeats the\nisolation that `supervisor.run.worker.as.user` is intended to provide.\n\nMitigation\n\nUpgrade to 3.1.0, where the resolved target must lie inside the expected root at both call sites.\n\nUsers who cannot upgrade immediately should restrict topology submission to trusted principals, and may\nreject submissions whose `topology.blobstore.map` entries contain path separators or `..` segments before\nthey reach Nimbus.\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"
}