# CVE-2026-34538: Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)

Status: published. Published: 2026-04-09. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: apache) — https://github.com/apache/airflow/pull/64415

## Affected products and versions

- Apache Software Foundation / Apache Airflow (apache-airflow-core): ≥ 3.0.0; < 3.2.0 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.69% as of 2026-11-02; percentile 52.60%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-668

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/apache/airflow/pull/64415 (CNA: apache; patch)

- https://lists.apache.org/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl (CNA: apache; vendor-advisory)

- http://www.openwall.com/lists/oss-security/2026/04/09/9 (ADP: CVE)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-34538; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-34538; retrieved 2026-11-03; source updated Not reported

Revision: 8853dc0a57a581a3d611ae3c8ccc24d86c62f08865e353abae41af690d86d4d2

Canonical: https://y2.dev/cve/CVE-2026-34538

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