AI analysis
The Apache Airflow SFTP provider disables SSH host-key verification by default on its deferrable code paths (SFTPTrigger, SFTPHookAsync, and SFTPClientPool) unless a connection explicitly sets no_host_key_check to false. Deployments that run SFTP sensors or operators in deferrable mode are affected. An attacker in a machine-in-the-middle position between the Airflow triggerer and the SFTP server can impersonate that server and capture credentials or data exchanged in the session. This is a separate defect from CVE-2026-94134 (the synchronous SSH hook default); apache-airflow-providers-sftp 7.0.0 fixes both. No public proof-of-concept is known, the issue is not in CISA KEV, and exploitation in the wild is not known.
What to do: Upgrade apache-airflow-providers-sftp to 7.0.0 or later, which also fixes the related synchronous defect CVE-2026-94134. Until then, set no_host_key_check to false on SFTP connections used by deferrable sensors or operators so host-key verification is not left off by default.
Affected
| Apache Software Foundation apache-airflow-providers-sftp | before 7.0.0 (deferrable paths: SFTPTrigger, SFTPHookAsync, SFTPClientPool) |
Estimated exposure
—No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description
The Apache Airflow SFTP provider's deferrable code paths (`SFTPTrigger`, `SFTPHookAsync`, `SFTPClientPool`) disable SSH host-key verification by default unless the connection explicitly sets `no_host_key_check` to false. Deployments that run SFTP sensors or operators in deferrable mode are affected. An attacker in a machine-in-the-middle position between the triggerer and the SFTP server can impersonate the server and capture the credentials or data exchanged. Users of apache-airflow-providers-sftp are recommended to upgrade to apache-airflow-providers-sftp 7.0.0 or later. This is a separate defect from CVE-2026-94134 (the synchronous SSH hook default, which also affects the SFTP hook); users who applied the fix for one also need this release for the other - apache-airflow-providers-sftp 7.0.0 fixes both.