CVE-2026-42360

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.

PUBLISHED Reserved 2026-04-26 | Published 2026-06-01 | Updated 2026-06-01 | Assigner apache

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

Credits

Vincent55 finder

Jarek Potiuk remediation developer

References

github.com/apache/airflow/pull/65906 patch

lists.apache.org/thread/obj79bpxnl7r5olz1gsn0g94y88glnl4 vendor-advisory

cve.org (CVE-2026-42360)

nvd.nist.gov (CVE-2026-42360)

Download JSON