CVE-2026-41016 json
Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider
published 2026-04-30 6 mo ago modified 2026-10-26 13 d ago also GHSA-x8mh-94wc-33gv , PYSEC-2026-24 , EUVD-2026-26359
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi apache-airflow-providers-smtp 3.0.0
- Apache Software Foundation Apache Airflow Providers SMTP 3.0.0
- github.com/apache/airflow#65346 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | apache-airflow-providers-smtp | >=2.0.0, <3.0.0 |
3.0.0 |
Affected products
- Apache Software Foundation Apache Airflow Providers SMTP
Classification
- Weakness
-
- CWE-295 Improper Certificate Validation
References
-
github.com
/apache/airflow/pull/65346
patch, web, issue-tracking
-
lists.apache.org
/thread/gb202qy5r31bgdd3d51d7s5o1jh40kc4
vendor-advisory, web, mailing-list, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-41016
advisory
-
github.com
/apache/airflow
package
-
github.com
/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-smtp/PYSEC-2026-24.yaml
web
-
github.com
/advisories/GHSA-x8mh-94wc-33gv
advisory
Sources
- CVE List CVE-2026-41016
- GitHub Advisory GHSA-x8mh-94wc-33gv
- NVD CVE-2026-41016
- OSV PYSEC-2026-24
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