CVE-2026-41016 json
Apache Airflow Providers SMTP: No certificate validation on SMTP STARTTLS connections in SMTP provider
published 6mo ago modified 14d ago also EUVD-2026-26359 , GHSA-x8mh-94wc-33gv , PYSEC-2026-24
- 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
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-09).
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 |
| GitHub | 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 |
| 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
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.