CVE-2026-41016

MEDIUM

Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider

Title source: cna
STIX 2.1

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 (2)

Core 2

Scores

CVSS v3 5.9
EPSS 0.0023
EPSS Percentile 13.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-295
Status published
Products (3)
apache/airflow 2.0.0 - 3.0.0
Apache Software Foundation/Apache Airflow Providers SMTP 2.0.0 - 3.0.0
pypi/apache-airflow-providers-smtp 2.0.0 - 3.0.0PyPI
Published Apr 30, 2026
Tracked Since Apr 30, 2026