CVE-2026-41016

[CVE catalog]

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.

Severity

Medium · CVSS 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Published

Apr 30, 2026, 10:16:01 AM UTC

Source

[NVD] · [CVE record]

EPSS

0.27% · Oct 27, 2026

{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "airflow",
      "ecosystem": "cpe",
      "fixed_version": "3.0.0"
    },
    {
      "name": "airflow",
      "ranges": [
        {
          "fixed": "3.0.0",
          "introduced": "2.0.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "3.0.0",
      "provider_record_id": "NVD-CVE-2026-41016"
    }
  ]
}