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.
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Discourse | Discourse | * | 3.0.1 (excluding) |
Attackers can create crafted inputs that
intentionally cause the regular expression to use
excessive backtracking in a way that causes the CPU
consumption to spike.