CVE-2026-49818

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`.

How to fix CVE-2026-49818

To remediate CVE-2026-49818, upgrade the affected package to a fixed version below.

• —upgrade to 4.12.6 or later

Is CVE-2026-49818 being exploited?

No exploitation signal available. Neither CISA KEV nor a current EPSS score has been published for CVE-2026-49818.

Affected packages (1)

• from 0, < 4.12.6

CVSS scores

References (3)

• ADVISORYlists.apache.org/thread/3vs0m3p51psgf54tts18d6336g24x3sf
• ADVISORYwww.openwall.com/lists/oss-security/2026/06/09/8
• PATCHgithub.com/apache/airflow/pull/67857