GitHub Advisoryadvisory · PyPI
GHSA-r7vr-m4jw-r794 Apache Airflow has an authorization bypass in DagRun wait endpoint
MEDIUM
Official page ↗
- Aliases
- CVE-2026-34538
- Ecosystem
- PyPI
- Packages
- apache-airflow
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-668
- Reviewed
- 2026-04-10
Affected packages
• PyPI apache-airflow: >= 3.0.0, < 3.2.0 → fixed in 3.2.0
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.
Related
Alias · CVE (1)
- CVE-2026-34538 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… vulnerability
Weakness · CWE (1)
- CWE-668 Exposure of Resource to Wrong Sphere weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-34538 advisory
- https://github.com/apache/airflow/pull/64415 web
- https://github.com/apache/airflow package
- https://github.com/apache/airflow/releases/tag/3.2.0 web
- https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-21.yaml web
- https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl web
- http://www.openwall.com/lists/oss-security/2026/04/09/9 web