apache-airflow-providers-smtp: No certificate validation on SMTP STARTTLS connections in SMTP provider
GHSA-x8mh-94wc-33gv · CVE-2026-41016 · PYSEC-2026-24
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Description
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.
References
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-41016
- WEB https://github.com/apache/airflow/pull/65346
- PACKAGE https://github.com/apache/airflow
- WEB https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-smtp/PYSEC-2026-24.yaml
- WEB https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4
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