CVE-2026-111422: Apache Airflow SSH provider: SSHRemoteJobOperator: `environment` values are executed as shell on the remote host

[Hussein Awala <husseinawala () apache org>]

Severity: low 

Affected versions:

- Apache Airflow SSH provider 4.3.0 before 7.0.1

Description:

In apache-airflow-providers-ssh before 7.0.1, SSHRemoteJobOperator quoted the values of its templated `environment` 
parameter only once, although they are placed inside an already-quoted wrapper script, so shell syntax such as `$(...)` 
in a value was executed on the remote SSH host. In a Dag that passes trigger-time input such as `params` or 
`dag_run.conf` into `environment`, a user who can trigger that Dag but cannot author Dags could run arbitrary commands 
on the remote host as the SSH connection's user. Users are advised to upgrade apache-airflow-providers-ssh to 7.0.1 or 
later.

Credit:

Enrico Maria Carmona, Serasoft S.r.l. (finder)
Kaxil Naik (remediation developer)

References:

https://github.com/apache/airflow/pull/74810
https://airflow.apache.org/docs/apache-airflow-providers-ssh/7.0.1/changelog.html
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-111422