{"id":"CVE-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":["BIT-airflow-2026-67587","GHSA-2qjv-p2gc-mjg2","PYSEC-2026-3708"],"modified":"2026-10-02T23:40:52.688196939Z","published":"2026-08-12T15:32:10.565Z","database_specific":{"cwe_ids":["CWE-502"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67587.json","cna_assigner":"apache"},"references":[{"type":"WEB","url":"https://pypi.python.org"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-58076"},{"type":"WEB","url":"https://www.cve.org/CVERecord?id=CVE-2026-67260"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67587.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-67587"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/70704"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/airflow","events":[{"introduced":"beedefac4f83459f9ce50937bd36c845a8a6b632"},{"fixed":"275ac7303fa702e232c277ac7f4929baa85464d2"}],"database_specific":{"extracted_events":[{"introduced":"3.3.0"},{"fixed":"3.3.1"}],"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*"}}],"versions":["task-sdk/1.3.1rc2","task-sdk/1.3.1","3.3.1rc2","3.3.1","task-sdk/1.3.1rc1","3.3.1rc1","python-client/3.3.0rc2","python-client/3.3.0rc1","python-client/3.3.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67587.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}