- Extensive bug fixes covering triggerer health checks, XCom handling, DAG serialization, connection parsing, UI rendering, and various operator edge cases.
- Security hardening by switching to re2 for untrusted regex matching and updating the security model documentation.
- Documentation enhancements: added details on tag cleanup, Listener API behavior, tutorial links, and other minor doc updates.
Apache Airflow 2.6.3
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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.