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Message-ID: <261e4259-b301-044a-b35f-0d21722a43c1@apache.org>
Date: Sun, 31 May 2026 11:35:50 +0000
From: Rahul Vats <rahulvats@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-40861: Apache Airflow: Arbitrary File Read via Log
Symlink following in FileTaskHandler
Severity: low
Affected versions:
- Apache Airflow (apache-airflow) before 3.2.2
Description:
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.
Credit:
Silas Boch (finder)
Lakshmikanthan K (letchupkt) (finder)
Jarek Potiuk (remediation developer)
References:
https://github.com/apache/airflow/pull/65325
https://airflow.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-40861
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