CVE-2026-42360 Apache Airflow: Rendered template truncation bypasses nested sensitive-key masking
Authenticated users can read unmasked sensitive keys in rendered templates if field length exceeds limits, exposing secrets like passwords and tokens.
- 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-2026-42360?
CVE-2026-42360 is a medium-severity vulnerability in Apache Airflow, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A bug in Apache Airflow's rendered-template field handling caused nested sensitive-key masking (e.g. nested `password` / `token` / `secret` / `api_key` keys inside a JSON template structure) to be bypassed when the rendered field exceeded `[core] max_templated_field_length`: Airflow stringified the structure before redaction, losing the nested key context, and persisted the plaintext value into `rendered_fields`. An authenticated UI/API user with permission to read rendered template fields could harvest secret values intended to be masked. Affects deployments where Dag authors pass structured JSON to operators with nested sensitive keys. This is a variant of `CWE-200` previously addressed for the user-registered `mask_secret()` patterns in CVE-2025-68438; that fix did not cover the nested sensitive-keyword allowlist. Users who already upgraded for CVE-2025-68438 should additionally upgrade to `apache-airflow` 3.2.2 or later to cover the nested-key path.
Weakness: CWE-200
Which versions are affected by CVE-2026-42360?
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 | 3.2.2 |
apache-airflow PyPI | All versions | 3.2.2 |
apache-airflow PyPI | All versions | 3.2.2 |
airflow Bitnami | All versions | 3.2.2 |
Products include Apache Airflow.
How do I fix CVE-2026-42360?
Upgrade apache-airflow to 3.2.2 or later.
Is CVE-2026-42360 being exploited?
There is no known exploitation of CVE-2026-42360 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-2026-42360, CLEANSTART-2026-QQ72344, ECHO-9b9a-e7b8-0e09, GHSA-cg3x-89rc-x9mw, MINI-g5j7-g2c4-qqcq, MINI-m4h2-9fmm-rvgm and 1 more.