CVE-2026-40861: 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…

medium6.5CVSS 3.1

AVNACLPRLUINSUCHINAN

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
apache	airflow	< 3.2.2	3.2.2
apache_software_foundation	apache_airflow	< 3.2.2	3.2.2