{"id":"CVE-2026-41016","aliases":["GHSA-x8mh-94wc-33gv","PYSEC-2026-24"],"url":"https://o3.security/vulnerability/CVE-2026-41016","summary":"Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider","details":"Apache Airflow's SMTP provider `SmtpHook` called Python's `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the TLS upgrade. A man-in-the-middle between the Airflow worker and the SMTP server could present a self-signed certificate, complete the STARTTLS upgrade, and capture the SMTP credentials sent during the subsequent `login()` call. Users are advised to upgrade to the `apache-airflow-providers-smtp` version that contains the fix.","published":"2026-04-30T09:09:45.529Z","modified":"2026-08-07T11:51:02.926869255Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":{"score":0.00268,"percentile":0.18705,"asOf":"2026-08-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"apache-airflow-providers-smtp","fixedVersion":"3.0.0"}],"fix":{"url":"https://github.com/apache/airflow/pull/65346","label":"apache/airflow#65346"},"references":[{"type":"WEB","url":"https://pypi.python.org"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41016.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41016"},{"type":"FIX","url":"https://github.com/apache/airflow/pull/65346"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:02.926869255Z"}}