What is CVE-2026-40861?

CVE-2026-40861 is a medium-severity vulnerability in Apache Airflow, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2026-06-01.

How severe is CVE-2026-40861?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Airflow

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 process (read-path attack — e.g. `/etc/passwd` or `airflow.cfg`) or (b) supply a `task_id` containing…

EPSS: 0.001 (25.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Apache Airflow
Apache Software Foundation Airflow — versions 0

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

security@apache.org (Patch, patch, Issue Tracking)
security@apache.org (vendor-advisory, Mailing List, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-40861?: CVE-2026-40861 is a medium-severity vulnerability in Apache Airflow, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2026-06-01.
How severe is CVE-2026-40861?: Medium severity. CVSS v3 base score is 6.5 out of 10.