CVE-2026-49486: Apache Airflow FTP provider: FTP Provider does not protect FTPS data channel (missing PROT_P)

[Shahar Epstein <shahar () apache org>]

Severity: moderate 

Affected versions:

- Apache Airflow FTP provider (apache-airflow-providers-ftp) before 3.15.1

Description:

The Apache Airflow FTP provider's `FTPSHook.get_conn()` created an `ftplib.FTP_TLS` connection but never called 
`prot_p()`, so although the control channel was TLS-protected the data channel was transmitted in cleartext. Any 
deployment using `FTPSHook` or `FTPSFileTransmitOperator` to move files over FTPS exposed file contents and 
credentials-in-transit to a network attacker able to observe the data connection. Upgrade apache-airflow-providers-ftp 
to `3.15.1` or later, which issues `PROT P` to encrypt the data channel.

Credit:

Andrew Rukin (Arenadata) (finder)
Shubham Raj (remediation developer)

References:

https://github.com/apache/airflow/pull/67946
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-49486