VULNERABILITY INTELLIGENCE

CVE-2026-41016

CVSS score5.9 MEDIUM
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-04-30
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Weakness classification

  • CWE-295: Improper Certificate Validation

Primary references