CVE-2026-40861

{
  "id": "CVE-2026-40861",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-01T09:16:17.893",
  "lastModified": "2026-11-03T07:19:54.920",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Airflow",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pypi.python.org",
          "packageName": "apache-airflow",
          "packageURL": "pkg:pypi/apache-airflow",
          "versions": [
            {
              "version": "0",
              "lessThan": "3.0.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Airflow",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pypi.python.org",
          "packageName": "apache-airflow-core",
          "packageURL": "pkg:pypi/apache-airflow-core",
          "versions": [
            {
              "version": "3.0.0",
              "lessThan": "3.2.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-02T16:33:03.378849Z",
          "id": "CVE-2026-40861",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "3.2.2",
              "matchCriteriaId": "0893C3AA-26A4-4682-A36C-05E719EB2943"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/apache/airflow/pull/65325",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://lists.apache.org/thread/823334db2559xjlwt59gpzjz47thnscl",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/05/31/1",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    }
  ]
}