- Date/time API parameters now require RFC3339 format and proper URL‑encoding; ISO‑8601 remains supported with a deprecation warning.
- Webserver `expose_hostname` default changed to False, disabling hostname exposure by default for security.
- Extensive bug‑fix wave covering log rendering, SIGTERM callbacks, scheduler crashes, KubernetesExecutor behavior, REST API auth, UI permissions, and many minor regressions.
Apache Airflow 2.5.2
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Updated XCom handling for pandas 3, now storing the class name; all components must be upgraded or DataFrames from pandas 3 become unreadable.