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`.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0070

Probability of exploitation

0.49%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

Affected Products

Vendor	Product	Versions
apache	apache-airflow-providers-samba	< 4.12.6

References

Advisories & Patches

https://github.com/apache/airflow/pull/67857 https://lists.apache.org/thread/3vs0m3p51psgf54tts18d6336g24x3sf

Other References

http://www.openwall.com/lists/oss-security/2026/06/09/8

Frequently Asked Questions

What is CVE-2026-49818? +

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`. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-49818? +

CVE-2026-49818 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0070, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-49818? +

CVE-2026-49818 affects products from apache, specifically: apache-airflow-providers-samba. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-49818? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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