{"id":"CVE-2026-67587","aliases":["BIT-airflow-2026-67587","GHSA-2qjv-p2gc-mjg2","PYSEC-2026-3708"],"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":"2026-10-21T02:59:03.090895137Z","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":{"score":0.00611,"percentile":0.46929,"asOf":"2026-09-02"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"apache-airflow","fixedVersion":"3.3.1"}],"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"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/1baee0bf987eb220f15398e43572e1ed819a0130"},{"type":"WEB","url":"https://github.com/apache/airflow/commit/2b598cb8b0570c941633be3d16a7eb912f73180c"},{"type":"PACKAGE","url":"https://github.com/apache/airflow"},{"type":"WEB","url":"https://github.com/apache/airflow/releases/tag/3.3.1"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow/PYSEC-2026-3708.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:59:03.090895137Z"}}