Improperly controlled sequential memory allocation in .NET allows an unauthorized attacker to deny service over a network.

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter allocates an object[] from each declared array length before the configured object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure requires an application to deserialize untrusted data through the affected formatter path and permit repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an object parameter and AddMessagePackProtocol() enabled. This ...

MessagePack for C# is a MessagePack serializer for C#. Prior to 2.5.303 and 3.1.9, deserializing attacker-controlled MessagePack data as System.Object through PrimitiveObjectFormatter can cause excessive memory allocation. The formatter allocates an object[] from each declared array length before the configured object-graph depth limit rejects the input, while nested array headers can reuse the same trailing unread bytes to satisfy per-header length validation. A comparatively small payload can therefore keep many large arrays alive at once. When an attacker can submit such data repeatedly, the allocations can cause severe managed-heap pressure, excessive garbage collection, process termination, or loss of service. Exposure requires an application to deserialize untrusted data through the affected formatter path and permit repeated attacker-controlled submissions, such as a reachable ASP.NET Core SignalR hub method with an object parameter and AddMessagePackProtocol() enabled. This iss

MessagePack-CSharp Denial of Service Vulnerability

MessagePack: Nested arrays can blow past buffer length limits

Уязвимость библиотеки сериализации MessagePack, связанная с ненадлежащим управлением последовательным распределением памяти, позволяющая нарушителю вызывать отказ в обслуживании

Critical: .NET 9.0 security, bug fix, and enhancement update

Critical: .NET 9.0 security, bug fix, and enhancement update

Critical: .NET 9.0 security, bug fix, and enhancement update

ELSA-2026-86172: .NET 9.0 security, bug fix, and enhancement update (CRITICAL)

ELSA-2026-86171: .NET 9.0 security, bug fix, and enhancement update (CRITICAL)

ELSA-2026-86170: .NET 9.0 security, bug fix, and enhancement update (CRITICAL)

Critical: .NET 8.0 security, bug fix, and enhancement update

Critical: .NET 8.0 security, bug fix, and enhancement update

Critical: .NET 8.0 security, bug fix, and enhancement update

ELSA-2026-86594: .NET 8.0 security, bug fix, and enhancement update (CRITICAL)

ELSA-2026-86169: .NET 8.0 security, bug fix, and enhancement update (CRITICAL)

ELSA-2026-86168: .NET 8.0 security, bug fix, and enhancement update (CRITICAL)

Critical: .NET 10.0 security, bug fix, and enhancement update

Critical: .NET 10.0 security, bug fix, and enhancement update