CVE-2026-49818: Apache Airflow Samba provider: Path traversal in GCSToSambaOperator via GCS object names

[Jarek Potiuk <potiuk () apache org>]

Severity: moderate 

Affected versions:

- Apache Airflow Samba provider (apache-airflow-providers-samba) before 4.12.6

Description:

The Apache Airflow Samba provider's `GCSToSambaOperator` joined GCS object names to the SMB destination path without a 
containment check, so an object named with `../` segments resolved a write path outside the configured 
`destination_path`. An attacker able to write objects into the source GCS bucket — typically an external data producer 
distinct from the trusted DAG author — could write files to arbitrary locations on the Samba target when the operator 
ran. Upgrade apache-airflow-providers-samba to 4.12.6 or later, which validates the resolved destination stays within 
`destination_path`.

Credit:

secuholic (finder)
Jarek Potiuk (remediation developer)

References:

https://github.com/apache/airflow/pull/67857
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-49818