Apache Airflow up to 3.1.8 DagRun Wait Endpoint exposure of resource

Summaryinfo

A vulnerability described as critical has been identified in Apache Airflow up to 3.1.8. This impacts an unknown function of the component DagRun Wait Endpoint. The manipulation results in exposure of resource. This vulnerability was named CVE-2026-34538. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Apache Airflow up to 3.1.8. Affected is an unknown code block of the component DagRun Wait Endpoint. The manipulation with an unknown input leads to a exposure of resource vulnerability. CWE is classifying the issue as CWE-668. The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented by selen. The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34538 since 03/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/09/2026).

Upgrading to version 3.2.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-20878). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Business Process Management Software

Vendor

• Apache

Name

• Airflow

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8

License

• open-source

Website

• Vendor: https://www.apache.org/
• Product: https://github.com/apache/airflow/

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Once again VulDB remains the best source for vulnerability data.

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