PYSEC-2026-2346

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/apache-airflow/PYSEC-2026-2346.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-2346
Aliases
Published
2026-07-13T15:35:22.979724Z
Modified
2026-07-13T16:43:53.054020376Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
Apache Airflow has no certificate validation on SMTP STARTTLS connections
Details

Apache Airflow's EmailOperator and the underlying airflow.utils.email helpers established SMTP STARTTLS connections without verifying the remote certificate when the deployment used [email] smtp_starttls=True without [email] smtp_ssl. An attacker positioned between the worker and the configured SMTP server (network MITM — typical hostile-network attack-surface for environments where the SMTP relay sits outside the worker's trust boundary) could present a self-signed certificate, have the worker complete the STARTTLS handshake silently, and capture the SMTP AUTH credentials and message contents the worker forwarded.

This CVE covers the core apache-airflow side of the same root cause already covered for the SMTP provider by CVE-2026-41016 (published 2026-04-27, covering apache-airflow-providers-smtp). Users who already applied the SMTP-provider fix from CVE-2026-41016 should additionally upgrade apache-airflow to 3.2.2 or later to cover the core-side path through airflow.utils.email. Affects deployments configured with smtp_starttls=True and smtp_ssl=False where the SMTP relay is reachable across a less-trusted network segment than the worker.

Users are advised to upgrade to apache-airflow 3.2.2 or later.

References

Affected packages

PyPI / apache-airflow

Package

Name
apache-airflow
View open source insights on deps.dev
Purl
pkg:pypi/apache-airflow

Affected ranges

Type
ECOSYSTEM
Events
Introduced
2.0.0
Fixed
3.2.2

Affected versions

2.*
2.0.0
2.0.1rc1
2.0.1rc2
2.0.1
2.0.2rc1
2.0.2
2.1.0rc1
2.1.0rc2
2.1.0
2.1.1rc1
2.1.1
2.1.2rc1
2.1.2
2.1.3rc1
2.1.3
2.1.4rc1
2.1.4rc2
2.1.4
2.2.0b1
2.2.0b2
2.2.0rc1
2.2.0
2.2.1rc1
2.2.1rc2
2.2.1
2.2.2rc1
2.2.2rc2
2.2.2
2.2.3rc1
2.2.3rc2
2.2.3
2.2.4rc1
2.2.4
2.2.5rc1
2.2.5rc2
2.2.5rc3
2.2.5
2.3.0b1
2.3.0rc1
2.3.0rc2
2.3.0
2.3.1rc1
2.3.1
2.3.2rc1
2.3.2rc2
2.3.2
2.3.3rc1
2.3.3rc2
2.3.3rc3
2.3.3
2.3.4rc1
2.3.4
2.4.0b1
2.4.0rc1
2.4.0
2.4.1rc1
2.4.1
2.4.2rc1
2.4.2
2.4.3rc1
2.4.3
2.5.0rc1
2.5.0rc2
2.5.0rc3
2.5.0
2.5.1rc1
2.5.1rc2
2.5.1
2.5.2rc1
2.5.2rc2
2.5.2
2.5.3rc1
2.5.3rc2
2.5.3
2.6.0b1
2.6.0rc1
2.6.0rc2
2.6.0rc3
2.6.0rc4
2.6.0rc5
2.6.0
2.6.1rc1
2.6.1rc2
2.6.1rc3
2.6.1
2.6.2rc1
2.6.2rc2
2.6.2
2.6.3rc1
2.6.3
2.7.0b1
2.7.0rc1
2.7.0rc2
2.7.0
2.7.1rc1
2.7.1rc2
2.7.1
2.7.2rc1
2.7.2
2.7.3rc1
2.7.3
2.8.0b1
2.8.0rc1
2.8.0rc2
2.8.0rc3
2.8.0rc4
2.8.0
2.8.1rc1
2.8.1
2.8.2rc1
2.8.2rc2
2.8.2rc3
2.8.2
2.8.3rc1
2.8.3
2.8.4rc1
2.8.4
2.9.0b1
2.9.0b2
2.9.0rc1
2.9.0rc2
2.9.0rc3
2.9.0
2.9.1rc1
2.9.1rc2
2.9.1
2.9.2rc1
2.9.2
2.9.3rc1
2.9.3
2.10.0b1
2.10.0b2
2.10.0rc1
2.10.0
2.10.1rc1
2.10.1
2.10.2rc1
2.10.2
2.10.3rc1
2.10.3rc2
2.10.3
2.10.4rc1
2.10.4
2.10.5rc1
2.10.5
2.11.0rc1
2.11.0
2.11.1rc1
2.11.1rc2
2.11.1
2.11.2rc1
2.11.2
3.*
3.0.0b4
3.0.0rc1
3.0.0rc1.post1
3.0.0rc1.post2
3.0.0rc1.post3
3.0.0rc1.post4
3.0.0rc2
3.0.0rc3
3.0.0rc4
3.0.0
3.0.1rc1
3.0.1
3.0.2rc1
3.0.2rc2
3.0.2
3.0.3rc1
3.0.3rc2
3.0.3rc3
3.0.3rc4
3.0.3rc5
3.0.3rc6
3.0.3
3.0.4rc1
3.0.4rc2
3.0.4
3.0.5rc1
3.0.5rc2
3.0.5rc3
3.0.5
3.0.6rc1
3.0.6rc2
3.0.6
3.1.0b1
3.1.0b2
3.1.0rc1
3.1.0rc2
3.1.0
3.1.1rc1
3.1.1rc2
3.1.1
3.1.2rc1
3.1.2rc2
3.1.2
3.1.3rc1
3.1.3
3.1.4rc1
3.1.4rc2
3.1.4
3.1.5rc1
3.1.5
3.1.6rc1
3.1.6
3.1.7rc1
3.1.7rc2
3.1.7
3.1.8rc1
3.1.8rc2
3.1.8
3.2.0b1
3.2.0b2
3.2.0rc1
3.2.0rc2
3.2.0
3.2.1rc1
3.2.1rc2
3.2.1rc3
3.2.1
3.2.2rc1
3.2.2rc2
3.2.2rc3

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/apache-airflow/PYSEC-2026-2346.yaml"