Security Advisory
CVE-2026-41016
CVE vulnerability detail — eXtreme Datacenter Security Operations
Description
Apache Airflows SMTP provider `SmtpHook` called Pythons `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.