What is CVE-2026-49267?

CVE-2026-49267 is a medium-severity vulnerability in Apache Airflow, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-06-01.

How severe is CVE-2026-49267?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Apache Airflow

CVE-2026-49267

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`…

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (18.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apache Airflow
Apache Software Foundation Airflow — versions 2.0.0

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

security@apache.org (Patch, patch, Issue Tracking)
security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2026-49267?: CVE-2026-49267 is a medium-severity vulnerability in Apache Airflow, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-06-01.
How severe is CVE-2026-49267?: Medium severity. CVSS v3 base score is 5.9 out of 10.