Apache Airflow <3.2.2: Log Path Traversal via FileTaskHandler
CVE-2026-40861 Published on June 1, 2026
Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler
A Dag author could either (a) create a symlink under their task's log directory pointing to an arbitrary file readable by the API server process (read-path attack e.g. `/etc/passwd` or `airflow.cfg`) or (b) supply a `task_id` containing `..` sequences accepted by the Task SDK's `KEY_REGEX` (write-path attack), and in both cases the FileTaskHandler resolves the log path outside the configured `base_log_folder`, leaking or overwriting arbitrary files. Only affects deployments where the worker log folder is shared with the API server. Users are advised to upgrade to `apache-airflow` 3.2.2 or later. As a defense-in-depth mitigation, deploy the worker and API server with separate log volumes so that worker-controlled paths cannot reach the API server's filesystem.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-40861 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-40861
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Affected Versions
Apache Software Foundation Apache Airflow:- Before 3.2.2 is affected.