Discourse is an open-source discussion platform. Prior to version 3.0.1 on the stable
branch and version 3.1.0.beta2 on the beta
and tests-passed
branches, a malicious user can cause a regular expression denial of service using a carefully crafted user agent. This issue is patched in version 3.0.1 on the stable
branch and version 3.1.0.beta2 on the beta
and tests-passed
branches. There are no known workarounds.