Link following in Apache Airflow - CVE-2026-40861
Published: June 4, 2026
Vulnerability identifier: #VU133374
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40861
CWE-ID: CWE-59
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Apache Foundation
Affected software:
Apache Airflow
Apache Airflow
Detailed vulnerability description
The vulnerability allows a remote user to read arbitrary files.
The vulnerability exists due to improper link resolution in FileTaskHandler when processing task log paths. A remote user can create a symlink under a task log directory to read arbitrary files.
Only deployments where the worker log folder is shared with the API server are affected.
How to mitigate CVE-2026-40861
Install security update from vendor's website.