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CVE-2026-40861
Published:June 01, 2026
Updated:June 07, 2026
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.
Affected Packages
apache-airflow (CONDA):
Affected version(s) >=3.0.0 <3.2.2
Fix Suggestion:
Update to version 3.2.2
apache-airflow (PYTHON):
Affected version(s) >=3.0.0 <3.2.2
Fix Suggestion:
Update to version 3.2.2
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CVSS v4
Base Score:
7.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Link Resolution Before File Access ('Link Following')
EPSS
Base Score:
0.10