CVE-2026-50203 Apache Software Foundation CVE debrief

Who should care

Organizations using Apache Airflow with the SFTP provider to download directories from untrusted SFTP servers should be aware of this critical vulnerability. This includes teams responsible for securing data pipelines, ensuring the integrity of their Airflow deployments, and maintaining compliance with security standards. Specifically, operators, platform administrators, vulnerability management teams, and security teams should prioritize this vulnerability and take immediate action to secure their deployments.

Technical summary

The CVE-2026-50203 vulnerability has a CVSS score of 9.1 and is classified as CRITICAL. It affects the Apache Airflow SFTP provider versions prior to 5.8.1. The vulnerability is caused by a path traversal issue in the SFTP provider, which allows an attacker to write files outside the intended directory. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. This vulnerability impacts deployments that download directories from untrusted SFTP servers, as it allows a malicious server to write files outside the configured local destination directory. The attack surface includes any deployment using the SFTP provider to download directories from untrusted SFTP servers, and no Airflow account is required for exploitation.

Defensive priority

High

Recommended defensive actions

• Upgrade `apache-airflow-providers-sftp` to version 5.8.1 or later
• Review and restrict access to SFTP servers to prevent untrusted connections
• Monitor Airflow deployments for suspicious activity
• Implement additional security controls, such as validating SFTP server connections and verifying file integrity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-06-17T13:20:47.213Z and was last modified on 2026-06-17T19:04:30.027Z. The NVD entry is currently Analyzed. The evidence basis for this CVE is limited to the information provided by the CVE record and the NVD entry. Defenders should verify the affected scope and severity with the official advisory and assess their exposure. The CVE details indicate a critical vulnerability in the SFTP provider of Apache Airflow, which could allow a malicious or compromised remote SFTP server to write files outside the configured local destination directory via crafted directory-entry names.

Official resources