Discourse is an open-source discussion platform. Prior to version 3.1.1 of the stable
branch and version 3.2.0.beta1 of the beta
and tests-passed
branches, a malicious admin could create extremely large icons sprites, which would then be cached in each server process. This may cause server processes to be killed and lead to downtime. The issue is patched in version 3.1.1 of the stable
branch and version 3.2.0.beta1 of the beta
and tests-passed
branches. This is only a concern for multisite installations. No action is required when the admins are trusted.