CVE-2026-67260

CVE-2026-67260 · Apache Airflow: DAG-author remote code execution on the Scheduler via awaiting_input next_kwargs deserialization

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

Apache Airflow 3.3.0 moved human-in-the-loop tasks from the triggerer to a new `awaiting_input` task state swept by the scheduler. That sweep deserializes the task instance's `next_kwargs` without an allow-list, so a Dag author — who controls that value through the task execution API — can cause an arbitrary module import and object instantiation inside the scheduler process, or terminate the scheduler job. No non-default configuration is required: the sweep runs unconditionally every 15 seconds, and the default `allowed_deserialization_classes` setting does not cover this code path. Versions before 3.3.0 are not affected, because human-in-the-loop tasks deferred onto the triggerer instead. This is a different code path from CVE-2026-58076, which covers the same unguarded exception-node deserialization reached elsewhere — deployments that applied that fix must upgrade for this issue as well. Users are advised to upgrade to apache-airflow 3.3.1 or later.

CVSS 7.3 · High · EPSS 0.8% · Fix available

Published

2026-08-12T15:33:02.858Z

Updated

2026-09-16T14:56:08.113Z

Stack: python

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