CVE-2026-42360: Apache Airflow: Rendered template truncation bypasses nested sensitive-key masking
This Apache advisory covers CVE-2026-42360 in Apache Airflow.
- CVE-2026-42360
Key facts
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N· base score 6.5, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: low. User interaction: none. Scope: unchanged. Confidentiality impact: high. Integrity impact: none. Availability impact: none.- Weakness
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
- CISA SSVC
- Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Apache Airflow before 3.0.0; Apache Airflow 3.0.0 before 3.2.2
- Fixed in
- 3.0.0, 3.2.2
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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.
Text from the source record.
- Apache Airflow before 3.0.0
- Apache Airflow 3.0.0 before 3.2.2
Official advisory · medium-confidence parse· fetched ·verify at source
How to fix CVE-2026-42360
Upgrade to a fixed release named by Apache:
- 3.0.0
- 3.2.2
Vendor guidance
- 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.
Support dates for the fixed release lines
- Apache Airflow 3.0: support ended
- Apache Airflow 3.2: support ended
More Apache Software Foundation advisories
CVE-2026-40913Nov 9, 2026Apache Airflow's public Import Errors API returns the raw parse-failure stack trace to anyCVE-2026-50204Nov 9, 2026Apache Airflow's audit log stored Connection and Variable secret values in cleartextCVE-2026-68982Nov 9, 2026Apache Airflow's CeleryExecutor ran callback workloadsCVE-2026-76185Nov 9, 2026Apache Airflow's Task SDK secret cache built its keys from the team name and secret idCVE-2026-86829Nov 9, 2026Apache Airflow's scheduler fully deserializes XCom values written by task codeCVE-2026-82337Nov 9, 2026Apache Airflow rebuilt deadline alert fields through generic deserialization
Apache Software Foundation advisories, June 2026All Apache Software Foundation advisories
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