Medium severity · published Apr 9, 2026
CVE-2026-34538
Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)
6.5
CVSS
0.7%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AA
Apache Airflow · Apache Software Foundation
3.0.0 before 3.2.0 · source: vendor
AI
Airflow · Apache
3.0.0 before 3.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34538
Broken Link
https://github.com/apache/airflow/pull/64415
Mailing List
https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl
Mailing List
http://www.openwall.com/lists/oss-security/2026/04/09/9
More from Apache Airflow
8.8
CVE-2020-11978
Apache Airflow Command Injection
9.8
CVE-2026-33264
Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()
9.8
CVE-2017-17836
In Apache Airflow 1.8.2 and earlier, an experimental Airflow feature displayed authenticated cookies, as well as passwords to databases used by Airflow
9.1
CVE-2026-86473
Apache Airflow: Logout ignores a presented Authorization bearer token, leaving it revocable only by expiry
9.1
CVE-2026-42252
Apache Airflow: BashOperator Jinja2 injection via dag_run.conf — low-privilege user pattern