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Message-ID: <b4b3b6b6-88fe-4ab8-b70b-ac9c3702892f@apache.org>
Date: Sun, 31 May 2026 11:42:43 +0000
From: Rahul Vats <rahulvats@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-49267: Apache Airflow: No certificate validation on SMTP
STARTTLS connections
Severity: low
Affected versions:
- Apache Airflow (apache-airflow) 2.0.0 before 3.2.2
Description:
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.
Credit:
Francis Bergin (@francisbergin) (finder)
Jarek Potiuk (remediation developer)
References:
https://github.com/apache/airflow/pull/65346
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-49267
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