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Apache AirflowPYSEC-2026-3706

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 wit

Medium6.5CVE-2026-59244 · Published Aug 12, 2026 · updated Aug 19, 2026

Source advisory

Affected versions

PackageAffectedFixed in
apache-airflow
PyPI
< 3.3.13.3.1
Details and references

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.

CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Severity from
the CVSS score
Also known as
BIT-airflow-2026-59244, CVE-2026-59244

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