Arbitrary file writes via GCS object names
Published Jun 9, 2026 · Updated Jun 9, 2026
Path traversal in Apache Airflow Samba provider before 4.12.6 allows remote authenticated users to write files outside the SMB destination. GCSToSambaOperator._resolve_destination_path joins each GCS object name to destination_path without normalization or a containment check, so ../ segments escape that directory. Exploitation requires write access to the source GCS bucket and an Airflow run using the operator; the resulting SMB write can place or overwrite files at attacker-chosen target paths.
Summary
What happened
Path traversal in Apache Airflow Samba provider before 4.12.6 allows remote authenticated users to write files outside the SMB destination. GCSToSambaOperator._resolve_destination_path joins each GCS object name to destination_path without normalization or a containment check, so ../ segments escape that directory. Exploitation requires write access to the source GCS bucket and an Airflow run using the operator; the resulting SMB write can place or overwrite files at attacker-chosen target paths.
The record
- CVE
- CVE-2026-49818
- Published
- Jun 9, 2026
- Updated
- Jun 9, 2026
- Vendor
- The Apache Software Foundation
- Product
- apache-airflow-providers-samba
- Classifications
- CWE-22, T1105
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 9, 2026CVE publishedPublication date reported by the CVE source.
- Jun 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <4.12.6
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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