CVE-2021-26697: Apache Airflow

Medium severity, CVSS 5.3. EPSS: 4.6% chance of exploitation in the next 30 days.

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.

Affected products

• Apache Airflow: version 2.0.0 only

Published 2021-02-17. Last modified 2026-06-17.