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Version 2.19.7 Release Notes

Compatible with OpenSearch and OpenSearch Dashboards version 2.19.7

Enhancements

  • Add upper bound for the hot_threads snapshots parameter with configurable monitor.jvm.hot_threads.max_snapshots cluster setting (#23144)
  • Add search.query.max_query_nesting_depth setting to limit query_string parenthesis nesting depth and prevent StackOverflowError (#22854)
  • Cap max_determinized_states in completion suggester regex and fuzzy options to prevent heap exhaustion (#22925)
  • Disable Mustache partial template resolution in search templates (#22440)
  • Reject out-of-range WLM node threshold updates at validation time (#22678)

Bug Fixes

  • Fix unbounded recursion in JSON and binary deserialization that could cause StackOverflowError (#22427)
  • Strengthen scroll_id validation to prevent OOM from crafted scroll IDs with oversized counts (#22401)
  • Validate base_path in fs repository to prevent path traversal outside configured path.repo directories (#22381)
  • Fix handling of unsupported zstd HTTP content encoding in netty4 and nio transports (#23324)

Maintenance

Source: README.md, updated 2026-10-17