Title: Apache Airflow de Apache Software Foundation, Description: El EmailOperator de Apache Airflow y las funciones auxiliares subyacentes 'airflow.utils.email' establecían conexiones SMTP STARTTLS sin verificar el certificado remoto cuando la implementación utilizaba '[email] smtp_starttls=True' sin '[email] smtp_ssl'. Un atacante posicionado entre el worker y el servidor SMTP configurado (MitM de red - superficie de ataque típica de red hostil para entornos donde el relé SMTP se encuentra fuera del límite de confianza del worker) podría presentar un certificado autofirmado, hacer que el worker completara el handshake STARTTLS silenciosamente, y capturar las credenciales SMTP AUTH y el contenido del mensaje que el worker reenviaba.

Este CVE cubre el lado central de apache-airflow de la misma causa raíz ya cubierta para el proveedor SMTP por 'CVE-2026-41016' (publicado el 27-04-2026, cubriendo 'apache-airflow-providers-smtp'). Los usuarios que ya aplicaron la corrección del proveedor SMTP de CVE-2026-41016 deberían actualizar adicionalmente 'apache-airflow' a 3.2.2 o posterior para cubrir la ruta del lado central a través de 'airflow.utils.email'. Afecta a las implementaciones configuradas con 'smtp_starttls=True' y 'smtp_ssl=False' donde el relé SMTP es accesible a través de un segmento de red menos confiable que el worker.

Se aconseja a los usuarios actualizar a 'apache-airflow' 3.2.2 o posterior.

{"timestamp":"2026-06-02T16:20:50.236710Z","id":"CVE-2026-49267","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"Apache Software Foundation","product":"Apache Airflow","defaultStatus":"unaffected","collectionURL":"https://pypi.python.org","packageName":"apache-airflow","versions":[{"version":"2.0.0","lessThan":"3.2.2","versionType":"semver","status":"affected"}]}]

OR
          *cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 3.2.2

Apache Software Foundation: https://github.com/apache/airflow/pull/65346 Types: Issue Tracking, Patch

Apache Software Foundation: https://lists.apache.org/thread/6v2ds757000msmjmovnnqryqzks83ps0 Types: Mailing List, Vendor Advisory

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

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.

CWE-295

https://github.com/apache/airflow/pull/65346

https://lists.apache.org/thread/6v2ds757000msmjmovnnqryqzks83ps0