CVE-2021-26697Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
- 5.3MediumCVSS base score
- 4.6%Exploitation in 30 daysEPSS · top 8.2% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By apache
- 13 days later
· 13 days later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 4.6% · top 8.2% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
Apache Software Foundation · Apache Airflow
- affected Apache Airflow 2.0.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIapache-airflowGHSA-fh37-cx83-q542 (opens in a new tab)
References
References4
- https://lists.apache.org/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E (opens in a new tab)x_refsource_MISCmailing-listx_refsource_MLISTx_transferred
- [oss-security] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [airflow-dev] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [announce] 20210217 CVE-2021-26697: Apache Airflow: Lineage API endpoint for Experimental API missed authentication check (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-0015 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-fh37-cx83-q542 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-26697)Record last updated .