CVE-2026-40861

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.

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Produits concernés

• Apache Software Foundation Apache Airflow
• Apache airflow

Scores CVSS

Faiblesses (CWE)

• CWE-59

Références

• https://github.com/apache/airflow/pull/65325 Issue TrackingPatch
• https://lists.apache.org/thread/823334db2559xjlwt59gpzjz47thnscl Mailing ListVendor Advisory
• http://www.openwall.com/lists/oss-security/2026/05/31/1 Mailing ListThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories