CVE-2021-26697 json
Apache Airflow: Lineage API endpoint for Experimental API missed authentication check
published 5y ago modified 2mo ago also BIT-airflow-2021-26697 , EUVD-2021-0015 , GHSA-fh37-cx83-q542 , PYSEC-2021-3
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.6%
- EPSS 4.6% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi apache-airflow 2.0.1, 2.0.1rc1
- bitnami airflow 2.0.1
Is CVE-2021-26697 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
4.56% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | apache-airflow | >=2.0.0, <2.0.1rc1 <2.0.1 |
2.0.1rc1 2.0.1 |
| bitnami | airflow | >=2.0.0, <2.0.1 |
2.0.1 |
Affected products
- Apache Software Foundation Apache Airflow
Classification
References
-
github.com
/apache/airflow/commit/21cedff205e7d62675949fda2aa4616d77232b76
web
-
github.com
/apache/airflow/commit/24a54242d56058846c7978130b3f37ca045d5142
web
-
github.com
/apache/airflow/commit/93957e917ff4cfb0be11aef088bd9527cf728a04
web
-
lists.apache.org
/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cusers.airflow.apache.org%3E
mailing-list, web, third-party-advisory, advisory
-
openwall.com
/lists/oss-security/2021/02/17/2
mailing-list, web, third-party-advisory, advisory
-
lists.apache.org
/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519%40%3Cdev.airflow.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9%40%3Cannounce.apache.org%3E
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-26697
advisory, web
-
github.com
/advisories/GHSA-fh37-cx83-q542
advisory
-
github.com
/apache/airflow
package
-
github.com
/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2021-3.yaml
web
-
lists.apache.org
/thread.html/r36111262a59219a3e2704c71e97cf84937dae5ba7a1da99499e5d8f9@%3Cannounce.apache.org%3E
web
-
lists.apache.org
/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cdev.airflow.apache.org%3E
web
-
lists.apache.org
/thread.html/re21fec81baea7a6d73b0b5d31efd07cc02c61f832e297f65bb19b519@%3Cusers.airflow.apache.org%3E
web
Sources
- CVE List CVE-2021-26697
- GitHub Advisory GHSA-fh37-cx83-q542
- NVD CVE-2021-26697
- OSV BIT-airflow-2021-26697
- OSV PYSEC-2021-3
Fencer Intel 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.