Medium [CVE-2026-96285] Apache Airflow 3.3.1 shipped a fix for CVE-2026-67260 that checks the scheduler's decoded `next_kwargs` value is a dictionary, but performs that check only after deserializing the whole stored payload
This medium-severity Apache Software Foundation advisory covers CVE-2026-96285; related products: Apache Airflow.
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Summary
Apache Airflow 3.3.1 shipped a fix for CVE-2026-67260 that checks the scheduler's decoded `next_kwargs` value is a dictionary, but performs that check only after deserializing the whole stored payload.
Deserialization reconstructs nested objects of classes permitted by the deserialization allow-list — which by default includes Airflow's own classes — and runs their constructors inside the scheduler process before the check can reject the value.
A Dag author, who controls a task's `next_kwargs` through the task execution API, can therefore still trigger constructor execution in the scheduler when the `awaiting_input` timeout sweep processes the task, and in the API server when the task instance is served to a worker using an older Execution API version; no non-default configuration is required.
Versions before 3.3.0 are not affected. This is an incomplete fix for CVE-2026-67260: deployments that upgraded to 3.3.1 for that issue must also upgrade to apache-airflow 3.4.0 or later.
Is CVE-2026-96285 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-96285 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-96285?
Upgrade to a fixed release named by Apache:
- 3.3.0
Confirm against the vendor advisory before you patch.
- Apache Airflow 3.3.0 before 3.4.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- This is an incomplete fix for CVE-2026-67260: deployments that upgraded to 3.3.1 for that issue must also upgrade to apache-airflow 3.4.0 or later.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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