CVE-2026-34538
Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)
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.
INFO
Published Date :
April 9, 2026, 10:16 a.m.
Last Modified :
April 15, 2026, 5:51 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade Apache Airflow to version 3.2.0 or later.
- Verify access controls for Viewer role after upgrade.
- Review Airflow RBAC model documentation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34538.
| URL | Resource |
|---|---|
| https://github.com/apache/airflow/pull/64415 | Issue Tracking Broken Link |
| https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/09/9 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34538 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34538
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34538 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34538 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 15, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.2.0 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/04/09/9 Types: Mailing List, Third Party Advisory Added Reference Type Apache Software Foundation: https://github.com/apache/airflow/pull/64415 Types: Broken Link, Issue Tracking Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl Types: Mailing List, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 09, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Apr. 09, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/04/09/9 -
New CVE Received by [email protected]
Apr. 09, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-668 Added Reference https://github.com/apache/airflow/pull/64415 Added Reference https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl