Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
Priority LOW 31CWE-269Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Privilege escalation, Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-269 and CWE-306.
Summary
The lineage endpoint of the deprecated Experimental API was not protected by authentication in Airflow 2.0.0. This allowed unauthenticated users to hit that endpoint. This is low-severity issue as the attacker needs to be aware of certain parameters to pass to that endpoint and even after can just get some metadata about a DAG and a Task. This issue affects Apache Airflow 2.0.0.
Why it matters now
EPSS 0.04555 91st percentileScored 2026-11-07
Fix Fixed apache-airflow (PyPI): 2.0.1rc1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache Airflow | Apache Airflow 2.0.0 | — | No fix listed | CNA |
| — | apache-airflow (PyPI) | 2.0.0 to before 2.0.1rc1 | 2.0.1rc1 | Patch available | GHSA-fh37-cx83-q542 |
- Apache Airflow VendorApache Affected Apache Airflow 2.0.0 Fixed in — No fix listed CNA
- apache-airflow (PyPI) Vendor— Affected 2.0.0 to before 2.0.1rc1 Fixed in 2.0.1rc1 Patch available GHSA-fh37-cx83-q542
Remediation
- Fix · GHSA-fh37-cx83-q542 apache-airflow (PyPI) Fixed in 2.0.1rc1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26697
- 2026-10-03 Alias added: GHSA-fh37-cx83-q542
References
Advisory 4
- https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E
- [oss-security] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
- https://nvd.nist.gov/vuln/detail/CVE-2021-26697
- https://github.com/advisories/GHSA-fh37-cx83-q542
Other 10
- [airflow-dev] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
- [announce] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
- https://github.com/apache/airflow/commit/21cedff205e7d62675949fda2aa4616d77232b76
- https://github.com/apache/airflow/commit/24a54242d56058846c7978130b3f37ca045d5142
- https://github.com/apache/airflow/commit/93957e917ff4cfb0be11aef088bd9527cf728a04
- https://github.com/apache/airflow
- https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-3.yaml
- https://lists.apache.org/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9@%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cdev.airflow.apache.org%3E
- https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cusers.airflow.apache.org%3E
More Apache Airflow vulnerabilities
- TI-2020-10905 Missing authentication in Apache Airflow KEVCVSS 3.1CRITICAL 9.8
- TI-2020-09638 OS command injection in Apache Airflow KEVCVSS 3.1HIGH 8.8
- TI-2022-19017 Apache Airflow <2.4.0 has an RCE in a bash example CVSS 3.1HIGH 8.8
- TI-2021-16140 Apache Airflow: Variable Import endpoint missed authentication check CVSS 3.1CRITICAL 9.8
- TI-2022-08169 Apache Airflow: RCE in example DAGs CVSS 3.1HIGH 8.8
- TI-2024-26776 Apache Airflow: DAG Author Code Execution possibility in airflow-scheduler CVSS 3.1HIGH 8.8
Sources
- CVE-2021-26697 · CVE Program
- CVE-2021-26697 · NVD
- FIRST EPSS
- GHSA-fh37-cx83-q542 · GitHub Advisory Database · CC BY 4.0
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