Apache Airflow Samba provider: Path traversal in GCSToSambaOperator via GCS object names
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub.
Summary
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`.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apache | Apache Airflow Samba provider | before 4.12.6 | 4.12.6 | Patch available | CNA |
| — | apache-airflow-providers-samba (PyPI) | before 4.12.6 | 4.12.6 | Patch available | GHSA-f6vj-48fm-hmvx |
- Apache Airflow Samba provider VendorApache Affected before 4.12.6 Fixed in 4.12.6 Patch available CNA
- apache-airflow-providers-samba (PyPI) Vendor— Affected before 4.12.6 Fixed in 4.12.6 Patch available GHSA-f6vj-48fm-hmvx
Remediation
- Fix · CNA Apache Airflow Samba provider (Apache Software Foundation) Fixed in 4.12.6
- Fix · GHSA-f6vj-48fm-hmvx apache-airflow-providers-samba (PyPI) Fixed in 4.12.6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-49818
- 2026-10-03 Alias added: GHSA-f6vj-48fm-hmvx
- 2026-10-25 EPSS moved to the below the 50th percentile
- 2026-11-04 EPSS moved to the 50th–90th percentile
References
Advisory 3
Sources
- CVE-2026-49818 · CVE Program
- CVE-2026-49818 · NVD
- FIRST EPSS
- GHSA-f6vj-48fm-hmvx · GitHub Advisory Database · CC BY 4.0
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