CVE-2026-75158: Apache Airflow: Assets events API returns asset events for every Dag with no per-Dag authorization filter

[Rahul Vats <rahulvats () apache org>]

Severity: moderate 

Affected versions:

- Apache Airflow before 3.3.2

Description:

Apache Airflow's `/assets/events` API returned asset events for every Dag in the deployment, with no filter restricting 
them to the Dags the caller is authorized to read. Any authenticated user holding asset-read access could therefore 
enumerate asset events — including the source Dag ID, task ID, run ID and event timestamps — for Dags they have no 
permission to see. Because the filter was also absent from the count query, `total_entries` and pagination disclosed 
the existence of hidden Dags even without inspecting individual rows. Deployments are affected whenever per-Dag access 
control is used to separate teams or tenants; no special configuration is required. Upgrade to apache-airflow 3.3.2 or 
later.

Credit:

n0mi1k (finder)
Jarek Potiuk (remediation developer)

References:

https://github.com/apache/airflow/pull/71741
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-75158