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  4. CVE 2026 40861 apache airflow arbitrary file read via log
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-40861GHSA-89CJ-XRPX-J79M

Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandlerCVE-2026-40861

Answer in brief

CVE-2026-40861 records a Medium severity (CVSS 6.5) vulnerability in Apache Airflow: Arbitrary File Read via Log Symlink following in FileTaskHandler. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/apache-airflow (generic), Apache Software Foundation/apache-airflow-core (generic), apache-airflow (pip). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 1, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Jul 10, 2026Material review Nov 3, 2026
Upstream Advisory

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-59
Source
CVE List V5
Source checked
Nov 3, 2026
References
6 linked sources
Open source record

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/apache-airflow (generic), Apache Software Foundation/apache-airflow-core (generic), apache-airflow (pip). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:apache:airflow:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/apache-airflowgeneric>=0 <3.0.03.0.0
Apache Software Foundation/apache-airflow-coregeneric>=3.0.0 <3.2.23.2.2
apache-airflowpip<3.2.23.2.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/apache-airflow, Apache Software Foundation/apache-airflow-core, apache-airflow.
  2. 2Review the reported fix. Update Apache Software Foundation/apache-airflow to 3.0.0; Apache Software Foundation/apache-airflow-core to 3.2.2; apache-airflow to 3.2.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Jun 1, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 3, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 10, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencelists.apache.org
  • Source referenceopenwall.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.