Apache Solr has been updated to version 9.6.1. Alongside, a new coremedia/solr-base Docker image with tag 2.3-cm-9.6.1 was released. As part of this change, Solr’s transitive dependency to Jetty has been updated to version 10.0.20, which fixes security vulnerability CVE-2024-222-01.

Solr 9.6.1 includes an update of Lucene, and indices written by the new version may become unreadable for previous Solr versions. You should make a backup of Solr indices before the update to be able to revert the update in case of unexpected problems. To avoid errors with Solr replication, followers should be updated at the same time or before leaders, or Solr replication should be stopped during upgrade, for example by disconnecting Solr followers from the Solr leader.

See https://solr.apache.org/docs/9_6_1/changes/Changes.html for a list of changes in Solr.

(CMS-24165)