Apache Airflow's EmailOperator and the underlying `airflow.utils.email` helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used `[email] smtp_starttls=True` without `[email] smtp_ssl`. An attacker positioned between the worker and the configured SMTP server (network MITM — typical hostile-network attack-surface for environments where the SMTP relay sits outside the worker's trust boundary) could present a self-signed certificate, have the worker complete the STARTTLS handshake silently, and capture the SMTP AUTH credentials and message contents the worker forwarded. This CVE covers the **core apache-airflow side** of the same root cause already covered for the SMTP provider by `CVE-2026-41016` (published 2026-04-27, covering `apache-airflow-providers-smtp`). Users who already applied the SMTP-provider fix from CVE-2026-41016 should additionally upgrade `apache-airflow` to 3.2.2 or later to cover the core-side path through `airflow.utils.email`. Affects deployments configured with `smtp_starttls=True` and `smtp_ssl=False` where the SMTP relay is reachable across a less-trusted network segment than the worker. Users are advised to upgrade to `apache-airflow` 3.2.2 or later.

• https://github.com/apache/airflow/pull/65346
• https://lists.apache.org/thread/6v2ds757000msmjmovnnqryqzks83ps0

• 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
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• Apache » Airflow » Version: 2.10.2
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• Apache » Airflow » Version: 2.10.3
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• Apache » Airflow » Version: 2.10.4
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• Apache » Airflow » Version: 2.10.5
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• Apache » Airflow » Version: 2.11.0
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• Apache » Airflow » Version: 2.11.1
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• Apache » Airflow » Version: 2.2.0
  cpe:2.3:a:apache:airflow:2.2.0
• Apache » Airflow » Version: 2.2.1
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• Apache » Airflow » Version: 2.2.2
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• Apache » Airflow » Version: 2.2.3
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• Apache » Airflow » Version: 2.2.4
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• Apache » Airflow » Version: 2.2.5
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• Apache » Airflow » Version: 2.3.0
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• Apache » Airflow » Version: 2.3.1
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• Apache » Airflow » Version: 2.3.3
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• Apache » Airflow » Version: 2.3.4
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• Apache » Airflow » Version: 2.4.0
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• Apache » Airflow » Version: 2.4.1
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• Apache » Airflow » Version: 2.4.3
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• Apache » Airflow » Version: 2.5.0
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• Apache » Airflow » Version: 2.6.0
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• Apache » Airflow » Version: 2.6.1
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• Apache » Airflow » Version: 2.6.2
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• Apache » Airflow » Version: 2.6.3
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• Apache » Airflow » Version: 2.7.0
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• Apache » Airflow » Version: 2.7.1
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• Apache » Airflow » Version: 2.7.2
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• Apache » Airflow » Version: 2.7.3
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• Apache » Airflow » Version: 2.8.0
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• Apache » Airflow » Version: 2.8.1
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• Apache » Airflow » Version: 2.8.2
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• Apache » Airflow » Version: 2.8.3
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• Apache » Airflow » Version: 2.8.4
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• Apache » Airflow » Version: 2.9.0
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• Apache » Airflow » Version: 2.9.1
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• Apache » Airflow » Version: 2.9.2
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• Apache » Airflow » Version: 2.9.3
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• Apache » Airflow » Version: 3.0.0
  cpe:2.3:a:apache:airflow:3.0.0
• Apache » Airflow » Version: 3.0.1
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• Apache » Airflow » Version: 3.0.2
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• Apache » Airflow » Version: 3.0.3
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• Apache » Airflow » Version: 3.0.4
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• Apache » Airflow » Version: 3.0.5
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• Apache » Airflow » Version: 3.0.6
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• Apache » Airflow » Version: 3.1.0
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• Apache » Airflow » Version: 3.1.1
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• Apache » Airflow » Version: 3.1.2
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• Apache » Airflow » Version: 3.1.3
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• Apache » Airflow » Version: 3.1.4
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• Apache » Airflow » Version: 3.1.5
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• Apache » Airflow » Version: 3.1.6
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• Apache » Airflow » Version: 3.1.7
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• Apache » Airflow » Version: 3.1.8
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• Apache » Airflow » Version: 3.2.0
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• Apache » Airflow » Version: 3.2.1
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