CVE-2026-41016

published 2026-04-30

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…

medium 5.9 CVSS 3.1

AV N AC H PR N UI N S U C H I N A N

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

2 ranges

Vendor	Product	Version range	Fixed in
apache	airflow	>= 2.0.0 < 3.0.0	3.0.0
apache_software_foundation	apache_airflow	>= 2.0.0 < 3.2.2	3.2.2

CWE-295