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.
History

Tue, 02 Jun 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*

Tue, 02 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 01 Jun 2026 11:30:00 +0000

Type Values Removed Values Added
References

Mon, 01 Jun 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache airflow
Vendors & Products Apache
Apache airflow

Mon, 01 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
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.
Title Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler
Weaknesses CWE-59
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-06-01T07:55:37.566Z

Updated: 2026-06-02T16:42:26.285Z

Reserved: 2026-04-15T13:58:24.192Z

Link: CVE-2026-40861

cve-icon Vulnrichment

Updated: 2026-06-01T09:52:20.189Z

cve-icon NVD

Status : Analyzed

Published: 2026-06-01T09:16:17.893

Modified: 2026-06-02T18:49:39.063

Link: CVE-2026-40861

cve-icon Redhat

No data.