CVE-2026-94134

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

State: Published
Severity: 9.1 Critical
Published: Oct 15, 2026
Updated: Oct 16, 2026
Reserved: Sep 20, 2026

Description

The Apache Airflow SSH provider hook disables SSH host-key verification by default: unless `host_key` is configured or `no_host_key_check` 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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-322 Key Exchange without Entity Authentication

Affected Products

Product	Versions
Apache Airflow SSH providerApache Software Foundation	before 7.0.0Affected
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-2026-94135related
https://lists.apache.org/thread/ksr1lztvd3zr74f8xd1hzch1ssl0l3ljvendor-advisory

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