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CVE-2026-40861

Estado: AnalizadaMedia (6.5)—

A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack — e.g. `/etc/passwd` or `airflow.cfg`) or (b) supply a `task_id` containing `..` sequences accepted by the Task SDK's `KEY_REGEX` (write-path attack), and in both cases the FileTaskHandler resolves the log path outside the configured `base_log_folder`, leaking or overwriting arbitrary files. Only affects deployments where the worker log folder is shared with the API server. Users are advised to upgrade to `apache-airflow` 3.2.2 or later. As a defense-in-depth mitigation, deploy the worker and API server with separate log volumes so that worker-controlled paths cannot reach the API server's filesystem.

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).

Tecnologías afectadas (1)

Apache — Airflow

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-40861",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-40861",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-06-02T16:33:03.378849Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Airflow",
          "versions": [
            {
              "status": "affected",
              "version": "0",
              "lessThan": "3.2.2",
              "versionType": "semver"
            }
          ],
          "packageName": "apache-airflow",
          "collectionURL": "https://pypi.python.org",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-06-01T09:16:17.893",
  "references": [
    {
      "url": "https://github.com/apache/airflow/pull/65325",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://lists.apache.org/thread/823334db2559xjlwt59gpzjz47thnscl",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/05/31/1",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack — e.g. `/etc/passwd` or `airflow.cfg`) or (b) supply a `task_id` containing `..` sequences accepted by the Task SDK's `KEY_REGEX` (write-path attack), and in both cases the FileTaskHandler resolves the log path outside the configured `base_log_folder`, leaking or overwriting arbitrary files. Only affects deployments where the worker log folder is shared with the API server. Users are advised to upgrade to `apache-airflow` 3.2.2 or later. As a defense-in-depth mitigation, deploy the worker and API server with separate log volumes so that worker-controlled paths cannot reach the API server's filesystem."
    },
    {
      "lang": "es",
      "value": "Un autor de Dag podría (a) crear un enlace simbólico bajo el directorio de logs de su tarea apuntando a un archivo arbitrario legible por el proceso del servidor API (ataque de ruta de lectura - p. ej. '/etc/pass1d' o 'airflow.cfg') o (b) proporcionar un 'task_id' que contenga secuencias '..' aceptadas por el 'KEY_REGEX' del SDK de Tareas (ataque de ruta de escritura), y en ambos casos el FileTaskHandler resuelve la ruta del log fuera de la 'base_log_folder' configurada, filtrando o sobrescribiendo archivos arbitrarios. Solo afecta a despliegues donde la carpeta de logs del worker es compartida con el servidor API. Se aconseja a los usuarios actualizar a 'apache-airflow' 3.2.2 o posterior. Como mitigación de defensa en profundidad, despliegue el worker y el servidor API con volúmenes de log separados para que las rutas controladas por el worker no puedan alcanzar el sistema de archivos del servidor API."
    }
  ],
  "lastModified": "2026-07-21T19:10:00.107",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0893C3AA-26A4-4682-A36C-05E719EB2943",
              "versionEndExcluding": "3.2.2"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@apache.org"
}