CVE-2026-41016Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider
Updated under an hour ago ()
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It affects Apache Software Foundation Apache Airflow Providers SMTP and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 5.9 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weakness (CWE)
- CWE-295
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- apache
- NVD analysis
- Analyzed
- Record last updated
- Apr 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Apache Software Foundation Apache Airflow Providers SMTP apache_software_foundation:apache_airflow_providers_smtp (from the name) | from 2.0.0 before 3.0.0 | CNA record |
apache airflow apache:airflow | from 2.0.0 before 3.0.0 | NVD |
References
- https://github.com/apache/airflow/pull/65346patch, issue-tracking
- https://lists.apache.org/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4vendor-advisory, mailing-list
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.