GHSA-X8MH-94WC-33GV

Vulnerability from github – Published: 2026-04-30 12:33 – Updated: 2026-05-22 13:04
VLAI
Summary
apache-airflow-providers-smtp: No certificate validation on SMTP STARTTLS connections in SMTP provider
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.

Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "apache-airflow-providers-smtp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "3.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41016"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-22T13:04:58Z",
    "nvd_published_at": "2026-04-30T10:16:01Z",
    "severity": "MODERATE"
  },
  "details": "Apache Airflow\u0027s SMTP provider `SmtpHook` called Python\u0027s `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": "GHSA-x8mh-94wc-33gv",
  "modified": "2026-05-22T13:04:58Z",
  "published": "2026-04-30T12:33:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41016"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/airflow/pull/65346"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/airflow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-smtp/PYSEC-2026-24.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "apache-airflow-providers-smtp: No certificate validation on SMTP STARTTLS connections in SMTP provider"
}


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