CVE-2026-59244 Apache Airflow: Secrets masker: `var.json` Variable values not masked in the Rendered Templates UI
Attackers with UI access can view unmasked secrets stored as JSON variables in Apache Airflow's Rendered Templates view.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59244?
CVE-2026-59244 is a medium-severity vulnerability in Apache Airflow, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Apache Airflow's secrets masker did not mask `var.json` Variable values whose value is a dict in the Rendered Templates UI — the dict value failed an `isinstance(str)` guard — so a secret stored as a JSON Variable and referenced in a template via `var.json` was displayed in cleartext to any user with access to that task's Rendered Templates view. Users are advised to upgrade to apache-airflow 3.3.1 or later, which masks nested Variable values regardless of type.
Weakness: CWE-312
Which versions are affected by CVE-2026-59244?
4 open source packages ship an affected version, including apache-airflow and airflow. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache-airflow PyPI | All versions | 3.3.1 |
apache-airflow PyPI | All versions | 3.3.1 |
apache-airflow PyPI | All versions | 3.3.1 |
airflow Bitnami | All versions | 3.3.1 |
Products include Apache Airflow.
How do I fix CVE-2026-59244?
Upgrade apache-airflow to 3.3.1 or later.
Is CVE-2026-59244 being exploited?
There is no known exploitation of CVE-2026-59244 in the wild and no public exploit code.
Other vulnerabilities in Apache Airflow
- CVE-2020-13927 Apache Airflow's Experimental API Authentication Bypass
- CVE-2020-11978 Apache Airflow Command Injection
- CVE-2026-33264 Apache Airflow: DAG author RCE on webserver via unrestricted import_string() in BaseSerialization.deserialize()
- CVE-2023-25754 Apache Airflow: Privilege escalation using airflow logs
- CVE-2023-22884 Apache Airflow, Apache Airflow MySQL Provider: Arbitrary file read via MySQL provider in Apache Airflow
Sources
Also known as BIT-airflow-2026-59244, CLEANSTART-2026-BP05337, CLEANSTART-2026-CG47796, ECHO-e66d-7d98-3409, GHSA-f643-3rc2-j27w, MINI-qwx8-crmg-g64m and 2 more.