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Vulnerability Details CVE-2026-41016

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.4%
CVSS Severity
CVSS v3 Score 5.9
Products affected by CVE-2026-41016
  • Apache » Airflow » Version: 2.0.0
    cpe:2.3:a:apache:airflow:2.0.0
  • Apache » Airflow » Version: 2.0.1
    cpe:2.3:a:apache:airflow:2.0.1
  • Apache » Airflow » Version: 2.0.2
    cpe:2.3:a:apache:airflow:2.0.2
  • Apache » Airflow » Version: 2.1.0
    cpe:2.3:a:apache:airflow:2.1.0
  • Apache » Airflow » Version: 2.1.1
    cpe:2.3:a:apache:airflow:2.1.1
  • Apache » Airflow » Version: 2.1.2
    cpe:2.3:a:apache:airflow:2.1.2
  • Apache » Airflow » Version: 2.1.3
    cpe:2.3:a:apache:airflow:2.1.3
  • Apache » Airflow » Version: 2.1.4
    cpe:2.3:a:apache:airflow:2.1.4
  • Apache » Airflow » Version: 2.10.0
    cpe:2.3:a:apache:airflow:2.10.0
  • Apache » Airflow » Version: 2.10.1
    cpe:2.3:a:apache:airflow:2.10.1
  • Apache » Airflow » Version: 2.10.2
    cpe:2.3:a:apache:airflow:2.10.2
  • Apache » Airflow » Version: 2.10.3
    cpe:2.3:a:apache:airflow:2.10.3
  • Apache » Airflow » Version: 2.10.4
    cpe:2.3:a:apache:airflow:2.10.4
  • Apache » Airflow » Version: 2.10.5
    cpe:2.3:a:apache:airflow:2.10.5
  • Apache » Airflow » Version: 2.11.0
    cpe:2.3:a:apache:airflow:2.11.0
  • Apache » Airflow » Version: 2.11.1
    cpe:2.3:a:apache:airflow:2.11.1
  • Apache » Airflow » Version: 2.2.0
    cpe:2.3:a:apache:airflow:2.2.0
  • Apache » Airflow » Version: 2.2.1
    cpe:2.3:a:apache:airflow:2.2.1
  • Apache » Airflow » Version: 2.2.2
    cpe:2.3:a:apache:airflow:2.2.2
  • Apache » Airflow » Version: 2.2.3
    cpe:2.3:a:apache:airflow:2.2.3
  • Apache » Airflow » Version: 2.2.4
    cpe:2.3:a:apache:airflow:2.2.4
  • Apache » Airflow » Version: 2.2.5
    cpe:2.3:a:apache:airflow:2.2.5
  • Apache » Airflow » Version: 2.3.0
    cpe:2.3:a:apache:airflow:2.3.0
  • Apache » Airflow » Version: 2.3.1
    cpe:2.3:a:apache:airflow:2.3.1
  • Apache » Airflow » Version: 2.3.3
    cpe:2.3:a:apache:airflow:2.3.3
  • Apache » Airflow » Version: 2.3.4
    cpe:2.3:a:apache:airflow:2.3.4
  • Apache » Airflow » Version: 2.4.0
    cpe:2.3:a:apache:airflow:2.4.0
  • Apache » Airflow » Version: 2.4.1
    cpe:2.3:a:apache:airflow:2.4.1
  • Apache » Airflow » Version: 2.4.3
    cpe:2.3:a:apache:airflow:2.4.3
  • Apache » Airflow » Version: 2.5.0
    cpe:2.3:a:apache:airflow:2.5.0
  • Apache » Airflow » Version: 2.6.0
    cpe:2.3:a:apache:airflow:2.6.0
  • Apache » Airflow » Version: 2.6.1
    cpe:2.3:a:apache:airflow:2.6.1
  • Apache » Airflow » Version: 2.6.2
    cpe:2.3:a:apache:airflow:2.6.2
  • Apache » Airflow » Version: 2.6.3
    cpe:2.3:a:apache:airflow:2.6.3
  • Apache » Airflow » Version: 2.7.0
    cpe:2.3:a:apache:airflow:2.7.0
  • Apache » Airflow » Version: 2.7.1
    cpe:2.3:a:apache:airflow:2.7.1
  • Apache » Airflow » Version: 2.7.2
    cpe:2.3:a:apache:airflow:2.7.2
  • Apache » Airflow » Version: 2.7.3
    cpe:2.3:a:apache:airflow:2.7.3
  • Apache » Airflow » Version: 2.8.0
    cpe:2.3:a:apache:airflow:2.8.0
  • Apache » Airflow » Version: 2.8.1
    cpe:2.3:a:apache:airflow:2.8.1
  • Apache » Airflow » Version: 2.8.2
    cpe:2.3:a:apache:airflow:2.8.2
  • Apache » Airflow » Version: 2.8.3
    cpe:2.3:a:apache:airflow:2.8.3
  • Apache » Airflow » Version: 2.8.4
    cpe:2.3:a:apache:airflow:2.8.4
  • Apache » Airflow » Version: 2.9.0
    cpe:2.3:a:apache:airflow:2.9.0
  • Apache » Airflow » Version: 2.9.1
    cpe:2.3:a:apache:airflow:2.9.1
  • Apache » Airflow » Version: 2.9.2
    cpe:2.3:a:apache:airflow:2.9.2
  • Apache » Airflow » Version: 2.9.3
    cpe:2.3:a:apache:airflow:2.9.3


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