CVE-2026-41016
Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-295 |
| Vendor | apache software foundation |
| Product | apache airflow providers smtp |
| Published | Apr 30, 2026 |
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Affected Versions
Apache Software Foundation / Apache Airflow Providers SMTP
2.0.0 < 3.0.0
References
Credits
Francis Bergin (@francisbergin) Jarek Potiuk