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CVE-2026-49818 Apache Software Foundation CVE debrief

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.

Vendor
Apache Software Foundation
Product
Apache Airflow Samba provider
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-12
Advisory published
2026-06-09
Advisory updated
2026-06-12

Who should care

Users of Apache Airflow with the Samba provider installed, particularly those who allow external data producers to write objects into the source GCS bucket.

Technical summary

The `GCSToSambaOperator` in the Apache Airflow Samba provider did not properly validate the destination path, allowing for a path traversal vulnerability. This could be exploited by an attacker who can write objects to the source GCS bucket, potentially leading to arbitrary file writes on the Samba target.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade apache-airflow-providers-samba to 4.12.6 or later, which validates the resolved destination stays within `destination_path`.

Evidence notes

CVE-2026-49818 was published on [cve-org]. The vulnerability details were obtained from [nvd]. Additional information can be found at [ref-4], [ref-5], and [ref-6].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49818 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49818

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49818 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49818

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.