GeoNetwork is a catalog application to manage spatially referenced resources. In versions prior to 4.2.10 and 4.4.5, the search end-point response headers contain information about Elasticsearch software in use. This information is valuable from a security point of view because it allows software used by the server to be easily identified. GeoNetwork 4.4.5 and 4.2.10 fix this issue. No known workarounds are available.
https://github.com/geonetwork/core-geonetwork/security/advisories/GHSA-52rf-25hq-5m33
https://github.com/geonetwork/core-geonetwork/releases/tag/4.4.5
https://github.com/geonetwork/core-geonetwork/releases/tag/4.2.10