{"id":"CVE-2026-67587","published":"2026-08-12T15:32:10Z","modified":"2026-09-16T14:56:11Z","title":"Apache Airflow: DAG-author remote code execution on the Scheduler via a Serde `Callback` deserialization gadget","vendor":"Apache","product":"Apache Airflow","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.00611,"percentile":0.49134,"provenance":"source"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"references":[{"url":"https://github.com/apache/airflow/pull/70704","tags":["patch"]},{"url":"https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0","tags":["vendor-advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-58076","tags":["related"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-67260","tags":["related"]}],"priority":{"score":16.0,"factors":[{"name":"EPSS percentile","points":9.83},{"name":"CVSS severity","points":6.16}]},"vendorSlug":"apache","affectedVersions":[{"vendor":"Apache Software Foundation","product":"Apache Airflow","versions":[">= 3.3.0, < 3.3.1"]}],"affected":[{"ecosystem":"PyPI","package":"apache-airflow","vulnerableRanges":[">=3.3.0, <3.3.1"],"patched":["3.3.1"],"from":["GHSA-2qjv-p2gc-mjg2","PYSEC-2026-3708"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-57274","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-apache-airflow-cve-2026-33264","parents":[{"from":"CVE-2026-58076","to":"CVE-2026-67587","relation":"related","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-2qjv-p2gc-mjg2","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-58076"},{"kind":"osv-related","provenance":"source","id":"PYSEC-2026-3708","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-58076"}]},{"from":"CVE-2026-67260","to":"CVE-2026-67587","relation":"related","confidence":"high","kind":"lineage","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-2qjv-p2gc-mjg2","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-67260"},{"kind":"osv-related","provenance":"source","id":"PYSEC-2026-3708","via":"reference","url":"https://www.cve.org/CVERecord?id=CVE-2026-67260"},{"kind":"similar","provenance":"machine","score":0.53,"basis":"same product + CWE + description similarity"}]}]}}