Misskey is an open source, federated social media platform. IVersions 8.63.0 and later, but prior to 2026.5.4, contain a vulnerability that can cause the Misskey web client to slow down or crash when it applies a malformed theme. This issue has been fixed in version 2026.5.4.
Uncontrolled Recursion The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.