Vulnerability Description
Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with the FAB RBAC model, which treats XCom as a separate protected resource, and with the security model documentation that defines the Viewer role as read-only. Airflow uses the FAB Auth Manager to manage access control on a per-resource basis. The Viewer role is intended to be read-only by default, and the security model documentation defines Viewer users as those who can inspect DAGs without accessing sensitive execution results. Users are recommended to upgrade to Apache Airflow 3.2.0 which resolves this issue.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Airflow | >= 3.0.0, < 3.2.0 |
Related Weaknesses (CWE)
References
- https://github.com/apache/airflow/pull/64415Issue TrackingBroken Link
- https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9flMailing ListVendor Advisory
- http://www.openwall.com/lists/oss-security/2026/04/09/9Mailing ListThird Party Advisory
FAQ
What is CVE-2026-34538?
CVE-2026-34538 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Apache Airflow versions 3.0.0 through 3.1.8 DagRun wait endpoint returns XCom result values even to users who only have DAG Run read permissions, such as the Viewer role.This behavior conflicts with t...
How severe is CVE-2026-34538?
CVE-2026-34538 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34538?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Airflow.