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 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.

• CWE-59

• https://github.com/apache/airflow/pull/65325Issue Tracking, Patch
• https://lists.apache.org/thread/823334db2559xjlwt59gpzjz47thnsclMailing List, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2026/05/31/1Mailing List, Third Party Advisory

Published

Jun 1, 2026

Last Modified

Jul 21, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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