{"id":"BIT-airflow-2026-67587","summary":"Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget","details":"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.","aliases":["CVE-2026-67587","PYSEC-2026-3708"],"modified":"2026-09-08T08:45:30.307731346Z","published":"2026-08-18T10:05:13.506Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:apache:airflow:*:*:*:*:*:python:*:*"]},"references":[{"type":"FIX","url":"https://github.com/apache/airflow/pull/70704"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67587"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-58076"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-67260"}],"affected":[{"package":{"name":"airflow","ecosystem":"Bitnami","purl":"pkg:bitnami/airflow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.3.0"},{"fixed":"3.3.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/airflow/BIT-airflow-2026-67587.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}],"schema_version":"1.9.0"}