CVE-2026-41084: Apache Airflow: API authorization bypass: bulk TaskInstances allows cross-DAG mutation

[Rahul Vats <rahulvats () apache org>]

Severity: medium 

Affected versions:

- Apache Airflow (apache-airflow) 3.2.0 before 3.2.2

Description:

A bug in Apache Airflow's bulk Task Instances API (`PATCH/DELETE 
/api/v2/dags/{dag_id}/dagRuns/{dag_run_id}/taskInstances`) evaluated authorization against the `dag_id` resolved from 
the URL path while operating on the `dag_id` / `dag_run_id` extracted from request-body entity fields. An authenticated 
UI/API user with edit permission on one Dag could mutate Task Instance state in any other Dag by keeping the authorized 
Dag's ID in the URL path and naming the target Dag's IDs in the request body entities. Affects deployments that rely on 
per-Dag edit-scope to keep Task Instance state isolated between teams. Users are advised to upgrade to `apache-airflow` 
3.2.2 or later.

Credit:

Pirikara (finder)
GPK (gopidesupavan) (remediation developer)

References:

https://github.com/apache/airflow/pull/64288
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-41084