medium5.9
CVE-2026-41016
Apache Airflow's SMTP provider `SmtpHook` called Python's `smtplib.SMTP.starttls()` without an SSL context, so no certificate validation was performed on the T…
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | apache-airflow-providers-smtp | >= 2.0.0, < 3.0.0 | 3.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apache | Airflow | from 2.0.0 before 3.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-x8mh-94wc-33gv
- https://nvd.nist.gov/vuln/detail/CVE-2026-41016
- https://github.com/apache/airflow/pull/65346
- https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4
- https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-smtp/PYSEC-2026-24.yaml