{"id":"CVE-2026-67587","aliases":[],"url":"https://o3.security/vulnerability/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.","published":"2026-08-12T15:32:10.565Z","modified":"2026-08-14T04:03:32.415706340Z","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/apache/airflow/pull/70704","label":"apache/airflow#70704"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:03:32.415706340Z"}}