CVE-2026-41016

MEDIUM

5.9

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/30/2026

Last Modified5/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

apache:airflow

Weaknesses (CWE)

CWE-295

References

https://github.com/apache/airflow/pull/65346(security@apache.org)

https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4(security@apache.org)

IOC Correlations

No correlations recorded

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