Low [CVE-2026-40913] Apache Airflow's public Import Errors API returns the raw parse-failure stack trace to any user with the `ImportError.can_read` permission when the failing file has no registered DAG
This low-severity Apache Software Foundation advisory covers CVE-2026-40913 affecting Apache Airflow.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
Apache Airflow's public Import Errors API returns the raw parse-failure stack trace to any user with the `ImportError.can_read` permission when the failing file has no registered DAG. This happens when a file fails to parse before any DAG is defined, or when all of its previously registered DAGs are removed but the parse error remains.
Users who should not see that file's details can read stack traces that may expose file paths and code.
Users are advised to upgrade to Apache Airflow 3.4.0 or later, which restricts these stack traces to users with the new `IMPORT_ERRORS_ALL` permission.
Is CVE-2026-40913 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-40913 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-40913?
Upgrade to a fixed release named by Apache:
- 3.4.0
Confirm against the vendor advisory before you patch.
- Apache Airflow before 3.4.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
- Users are advised to upgrade to Apache Airflow 3.4.0 or later, which restricts these stack traces to users with the new `IMPORT_ERRORS_ALL` permission.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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