CVE-2026-67587

CVE-2026-67587 · Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Apache Airflow's Task SDK rebuilt a `Callback` object from serialized data by re-running its constructor, which imports the module named by the stored callback path. Because `SyncCallback` is itself an Airflow class it passes the default `allowed_deserialization_classes` allow-list, so tightening that setting does not help. A Dag author — who controls a task instance's `next_kwargs` through the task execution API — can therefore cause an arbitrary module to be imported inside the scheduler process, when the scheduler's `awaiting_input` timeout sweep deserializes that value. No non-default configuration is required; the sweep runs unconditionally. Versions before 3.3.0 are not affected: the class existed, but the scheduler sweep that reaches it did not. This is a separate code path from CVE-2026-58076 and CVE-2026-67260, which cover different gadgets reaching deserialization — applying either of those fixes does not address this one. Users are advised to upgrade to apache-airflow 3.3.1 or later.

CVSS 8.8 · High · EPSS 0.6% · Fix available

Published

2026-08-12T15:32:10.565Z

Updated

2026-09-16T14:56:11.653Z

Stack: python

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