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.
{
"cwe_ids": [
"CWE-312"
],
"github_reviewed": true,
"github_reviewed_at": "2026-10-02T23:13:15Z",
"nvd_published_at": "2026-08-12T16:17:09Z",
"severity": "MODERATE"
}