GitHub Advisoryadvisory · PyPI

GHSA-89cj-xrpx-j79m Apache Airflow has a Link Following issue

MEDIUM Published 2026-06-01 Modified 2026-07-09 Official page ↗
Aliases
CVE-2026-40861
Ecosystem
PyPI
Packages
apache-airflow
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-59
Reviewed
2026-07-09

Affected packages

• PyPI apache-airflow: < 3.2.2 → fixed in 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.

Related

Alias · CVE (1)

  • 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… vulnerability

Weakness · CWE (1)

  • CWE-59 Improper Link Resolution Before File Access weakness

References