GeoServer 2.18.6 is now available, see announcement for details.
All users of GeoServer 2.18.5 and earlier are encouraged to update immediately. Although the GeoServer 2.18 branch had reached its scheduled end-of-life, and additional release has been made due to Jiffle and GeoTools RCE vulnerabilities.
Thanks to Andrea Aime (GeoSolutions) and Jody Garnett (GeoCat) for making this release on behalf of their customers.
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GeoServer Project Steering Committee