High [CVE-2026-86829] Apache Airflow's scheduler fully deserializes XCom values written by task code while evaluating task dependencies
This high-severity Apache Software Foundation advisory covers CVE-2026-86829; related products: Apache Airflow.
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Summary
Apache Airflow's scheduler fully deserializes XCom values written by task code while evaluating task dependencies.
A Dag author, who controls what a task writes to XCom, therefore controls data that is deserialized inside the scheduler process - a context the Airflow security model reserves for code installed by the Deployment Manager, above the worker-scoped execution capability a Dag author is documented to have.
Deployments that treat Dag authors as less trusted than Deployment Managers are affected, and the scheduler must be evaluating a task dependency that reads a task-written XCom value. Users of apache-airflow are recommended to upgrade to version 3.4.0 or later, which restricts dependency evaluation to primitive XCom values.
Is CVE-2026-86829 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-86829 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-2026-86829?
Upgrade to a fixed release named by Apache:
- 3.4.0
Confirm against the vendor advisory before you patch.
- Apache Airflow before 3.4.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Users of apache-airflow are recommended to upgrade to version 3.4.0 or later, which restricts dependency evaluation to primitive XCom values.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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