affected:
- package:
    ecosystem: PyPI
    name: apache-airflow-providers-smtp
    purl: pkg:pypi/apache-airflow-providers-smtp
  ranges:
  - events:
    - introduced: 2.0.0
    - fixed: 3.0.0
    type: ECOSYSTEM
  versions:
  - 2.0.0
  - 2.0.1
  - 2.0.1rc1
  - 2.0.2
  - 2.0.2rc1
  - 2.0.3
  - 2.0.3rc1
  - 2.1.0
  - 2.1.0rc1
  - 2.1.1
  - 2.1.1rc1
  - 2.1.2
  - 2.1.2rc1
  - 2.2.0
  - 2.2.0rc1
  - 2.2.1
  - 2.2.1rc1
  - 2.3.0
  - 2.3.0rc1
  - 2.3.1
  - 2.3.1rc1
  - 2.3.2
  - 2.3.2rc1
  - 2.4.0
  - 2.4.0rc1
  - 2.4.1
  - 2.4.1rc1
  - 2.4.2
  - 2.4.2rc1
  - 2.4.3
  - 2.4.3rc1
  - 2.4.4
  - 2.4.4rc1
  - 2.4.5
  - 2.4.5rc1
  - 3.0.0rc1
aliases:
- CVE-2026-41016
- GHSA-x8mh-94wc-33gv
details: 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.
id: PYSEC-2026-24
modified: '2026-05-20T09:18:52.135285Z'
published: '2026-04-30T10:16:01.930Z'
references:
- type: ADVISORY
  url: https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4
- type: FIX
  url: https://github.com/apache/airflow/pull/65346
- type: ADVISORY
  url: https://github.com/advisories/GHSA-x8mh-94wc-33gv
severity:
- score: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
  type: CVSS_V3