---
id: CVE-2026-59244
title: >-
  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 tem…
summary: >-
  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 tem…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-312
vendor: apache
product: airflow
affected:
  - airflow < 3.3.1
patched:
  - airflow 3.3.1
published: '2026-08-12'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:17:39.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59244'
references:
  - url: 'https://github.com/apache/airflow/pull/68975'
    label: security@apache.org
  - url: 'https://lists.apache.org/thread/fncod6vttfo5fvmfs3h9r8s2kmm9j1n6'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/08/12/7'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - osv
  - pip
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-18T13:43:56.777503Z'
epss: 0.0023
epssPercentile: 0.14049
aliases:
  - PYSEC-2026-3706
  - BIT-airflow-2026-59244
ecosystem: pip
ingestedAt: '2026-08-19T19:22:21.303Z'
---

## Overview

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.

## Affected

- `airflow < 3.3.1`

## Remediation

Upgrade past the affected range:

- `airflow 3.3.1`

## Package advisory (CVE-2026-59244)

Affected packages:

- `apache-airflow < 3.3.1`

Patched in:

- `apache-airflow 3.3.1`

Source: https://osv.dev/vulnerability/PYSEC-2026-3706