{"cve":"CVE-2026-67587","nvd":{"published":"2026-08-12T16:17:15.090","modified":"2026-10-24T16:10:00.153","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-502"],"references":["https://github.com/apache/airflow/pull/70704","https://lists.apache.org/thread/o00ww4n69qojvsckb464dtwd2nhzy6t0","https://www.cve.org/CVERecord?id=CVE-2026-58076","https://www.cve.org/CVERecord?id=CVE-2026-67260"],"products":["apache:airflow"],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-67587","score":0.00611,"percentile":0.48978,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-2qjv-p2gc-mjg2","url":"https://osv.dev/vulnerability/GHSA-2qjv-p2gc-mjg2","summary":"Apache Airflow Task SDK Callback deserialization can import arbitrary modules in the scheduler","modified":"2026-10-02T23:40:52.688196939Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=3.3.0 <3.3.1"],"fixed":["3.3.1"]}]},{"id":"PYSEC-2026-3708","url":"https://osv.dev/vulnerability/PYSEC-2026-3708","summary":"","modified":"2026-10-15T14:45:07.391263468Z","packages":[{"ecosystem":"PyPI","name":"apache-airflow","purl":"pkg:pypi/apache-airflow","ranges":[">=3.3.0 <3.3.1"],"fixed":["3.3.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}