A vulnerability classified as problematic has been found in MessagePack-CSharp MessagePack for C# up to 2.5.300/3.1.6 . This affects the function options.Security.GetEqualityComparer . This manipulation causes inefficient algorithmic complexity. This vulnerability is tracked as CVE-2026-48516 . The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.