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### Summary XInclude substitution performed by `Nokogiri::XML::Node#do_xinclude` replaced each `<xi:include>` in place, freeing the include node along with its children (such as `<xi:fallback>` and its descendants) and any namespaces declared on them. If an application had already exposed one of those nodes or namespaces to Ruby, the corresponding Ruby object was left pointing at freed memory. Using the object could result in invalid reads or writes to memory. Nokogiri 1.19.4 substitutes each