CVE-2026-94135

Apache Airflow SFTP provider: Async SFTP hook disables host-key verification by default

State: Published
Severity: 4.3 Medium
Published: Oct 15, 2026
Updated: Oct 16, 2026
Reserved: Sep 20, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N	CISA-ADP

Weaknesses

CWE-322 Key Exchange without Entity Authentication

Affected Products

Product	Versions
Apache Airflow SFTP providerApache Software Foundation	before 7.0.0Affected

References

https://github.com/apache/airflow/pull/73419patch
https://www.cve.org/CVERecord?id=CVE-2026-94134related
https://lists.apache.org/thread/jbzs97t9y1zd1yp5rvxzjbx90mqz82kfvendor-advisory

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