Bug 2569024 (CVE-2026-86829)

Summary: CVE-2026-86829 apache-airflow: apache-airflow: Privilege escalation via insecure deserialization of task-supplied data in scheduler
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Apache Airflow. The scheduler component insecurely deserializes cross-communication (XCom) data generated by task code while evaluating task dependencies. A user authorized to create Directed Acyclic Graph (DAG) workflows can exploit this issue by submitting crafted task data, resulting in privilege escalation and arbitrary code execution within the higher-privileged scheduler process.
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Description OSIDB Bzimport 2026-11-09 10:01:44 UTC 
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.