Dashboard / CVE-2026-40861

CVE-2026-40861

MEDIUM
MEDIUM Priority: 0.04 BB Relevance: 63/100
Published: 2026-06-01 Modified: 2026-11-03 First seen: 2026-11-03 Status: active

Attack Surface

Network Low Complexity No Interaction Conf. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Unchanged
C: High
I: None
A: None

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.

Weakness Classification (1)

Affected Software (3)

VendorProductVersion
Apache Software Foundation Apache Airflow 0 < 3.0.0
Apache Software Foundation Apache Airflow 3.0.0 < 3.2.2
apache airflow < 3.2.2

References & Advisories (3)

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploitation Probability

0.69%
Raw Score 0.006910
Percentile 52.8%
Date 2026-11-02

Intelligence Sources

mitre ref →
nvd ref →

External Links