CVE-2026-34538 json
Apache Airflow: Authorization bypass in DagRun wait endpoint (XCom exposure)
published 2026-04-09 7 mo ago modified 2026-11-03 6 d ago also BIT-airflow-2026-34538 , EUVD-2026-20878 , GHSA-r7vr-m4jw-r794 , PYSEC-2026-21
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi apache-airflow 3.2.0
- bitnami airflow 3.2.0
- Apache Software Foundation Apache Airflow 3.2.0
- github.com/apache/airflow#64415 pull request
- github.com/apache/airflow/releases/tag/3.2.0 release
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | apache-airflow | >=3.0.0, <3.2.0 |
3.2.0 |
| bitnami | airflow | >=3.0.0, <3.2.0 |
3.2.0 |
Affected products
- Apache Software Foundation Apache Airflow
Classification
- Weakness
-
- CWE-668 Exposure of Resource to Wrong Sphere
References
-
github.com
/apache/airflow/pull/64415
patch, web, broken-link, issue-tracking, report
-
lists.apache.org
/thread/9mq3msqhmgjwdzbr6bgthj4brb3oz9fl
vendor-advisory, web, mailing-list, advisory
-
openwall.com
/lists/oss-security/2026/04/09/9
web, mailing-list, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34538
advisory, web
-
github.com
/apache/airflow
package
-
github.com
/apache/airflow/releases/tag/3.2.0
web
-
github.com
/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-21.yaml
web
-
github.com
/advisories/GHSA-r7vr-m4jw-r794
advisory
Sources
- CVE List CVE-2026-34538
- GitHub Advisory GHSA-r7vr-m4jw-r794
- NVD CVE-2026-34538
- OSV BIT-airflow-2026-34538
- OSV PYSEC-2026-21
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.