Security advisory

{
  "id": "9be4c7bfdf3f3e52aa74509297dd9f933dfe764ae6fe22acadedde98d9ccfaf8",
  "url": "https://osv.dev/vulnerability/CVE-2021-26697",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-26697",
    "summary": "The lineage endpoint of the deprecated Experimental API was not protected by authentication in Airflow 2.0.0. This allowed unauthenticated users to hit that endpoint. This is low-severity issue as the attacker needs to be aware of certain parameters to pass to that endpoint and even after can just get some metadata about a DAG and a Task. This issue affects Apache Airflow 2.0.0.",
    "evidence": "osv:CVE-2021-26697",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-26697",
      "aliases": [
        "BIT-airflow-2021-26697",
        "CVE-2021-26697",
        "GHSA-fh37-cx83-q542",
        "PYSEC-2021-3"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/airflow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8217db8cb4b1ff302c5cf8662477ac00f701e78c"
                },
                {
                  "last_affected": "8217db8cb4b1ff302c5cf8662477ac00f701e78c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:airflow:2.0.0:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.0",
            "providers-zendesk/2.0.0",
            "providers-yandex/2.0.0",
            "providers-vertica/2.0.0",
            "providers-trino/2.0.0",
            "providers-telegram/2.0.0",
            "providers-tableau/2.0.0",
            "providers-ssh/2.0.0",
            "providers-sqlite/2.0.0",
            "providers-snowflake/2.0.0",
            "providers-slack/4.0.0",
            "providers-singularity/2.0.0",
            "providers-sftp/2.0.0",
            "providers-sendgrid/2.0.0",
            "providers-segment/2.0.0",
            "providers-samba/2.0.0",
            "providers-salesforce/3.0.0",
            "providers-redis/2.0.0",
            "providers-qubole/2.0.0",
            "providers-presto/2.0.0",
            "providers-postgres/2.0.0",
            "providers-plexus/2.0.0",
            "providers-papermill/2.0.0",
            "providers-pagerduty/2.0.0",
            "providers-oracle/2.0.0",
            "providers-opsgenie/2.0.0",
            "providers-openfaas/2.0.0",
            "providers-odbc/2.0.0",
            "providers-neo4j/2.0.0",
            "providers-mysql/2.0.0",
            "providers-mongo/2.0.0",
            "providers-microsoft-winrm/2.0.0",
            "providers-microsoft-mssql/2.0.0",
            "providers-microsoft-azure/3.0.0",
            "providers-jira/2.0.0",
            "providers-jenkins/2.0.0",
            "providers-jdbc/2.0.0",
            "providers-imap/2.0.0",
            "providers-http/2.0.0",
            "providers-hashicorp/2.0.0",
            "providers-grpc/2.0.0",
            "providers-google/4.0.0",
            "providers-ftp/2.0.0",
            "providers-facebook/2.0.0",
            "providers-exasol/2.0.0",
            "providers-elasticsearch/2.0.1",
            "providers-docker/2.0.0",
            "providers-discord/2.0.0",
            "providers-dingding/2.0.0",
            "providers-datadog/2.0.0",
            "providers-databricks/2.0.0",
            "providers-cncf-kubernetes/2.0.0",
            "providers-cloudant/2.0.0",
            "providers-celery/2.0.0",
            "providers-asana/1.0.0",
            "providers-apache-sqoop/2.0.0",
            "providers-apache-spark/2.0.0",
            "providers-apache-pinot/2.0.0",
            "providers-apache-pig/2.0.0",
            "providers-apache-livy/2.0.0",
            "providers-apache-kylin/2.0.0",
            "providers-apache-hive/2.0.0",
            "providers-apache-hdfs/2.0.0",
            "providers-apache-druid/2.0.0",
            "providers-apache-cassandra/2.0.0",
            "providers-apache-beam/3.0.0",
            "providers-amazon/2.0.0",
            "providers-airbyte/2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-26697.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:05.853265610Z",
      "provider": "osv",
      "references": [
        "https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9%40%3Cannounce.apache.org%3E",
        "https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cdev.airflow.apache.org%3E",
        "https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-26697",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440862,
  "published_at": "2021-02-17T15:15:13.593+00:00"
}