Severity: moderate

Affected versions:

- Apache Airflow SSH provider before 7.0.0 - Apache Airflow SFTP provider before 7.0.0

Description:

The Apache Airflow SSH provider hook disables SSH host-key verification by default: unless hostkey is configured or nohostkeycheck is explicitly set to false, it accepts any server key. This affects SSH and SFTP connections that rely on the default. An attacker in a machine-in-the-middle position between the worker and the SSH or SFTP server can impersonate the server and capture the credentials or data a task sends.

Users of apache-airflow-providers-ssh and apache-airflow-providers-sftp are recommended to upgrade to apache-airflow-providers-ssh 7.0.0 and apache-airflow-providers-sftp 7.0.0 or later. The deferrable SFTP code paths had the same default and are covered separately by CVE-2026-94135; apache-airflow-providers-sftp 7.0.0 fixes both.

Credit:

Claude Security Scans (tool) Igor Stepansky, OX Security (finder) Jarek Potiuk (remediation developer)

References:

https://github.com/apache/airflow/pull/73419 https://www.cve.org/CVERecord?id=CVE-2026-94135 https://airflow.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-94134

The Apache Airflow SSH provider hook disables SSH host-key verification by default: unless hostkey is configured or nohostkeycheck is explicitly set to false, it accepts any server key. This affects SSH and SFTP connections that rely on the default. An attacker in a machine-in-the-middle position between the worker and the SSH or SFTP server can impersonate the server and capture the credentials or data a task sends.

Users of apache-airflow-providers-ssh and apache-airflow-providers-sftp are recommended to upgrade to apache-airflow-providers-ssh 7.0.0 and apache-airflow-providers-sftp 7.0.0 or later. The deferrable SFTP code paths had the same default and are covered separately by CVE-2026-94135; apache-airflow-providers-sftp 7.0.0 fixes both.