CVE-2026-48515

Summary: CVE-2026-48515 affects MessagePack-CSharp. Before versions 2.5.301 and 3.1.7, multi-dimensional array formatters allocate T[,] / T[,,] / T[,,,] using dimension lengths read from the payload before validating the encoded element count, enabling large heap allocations. Impact: potential hi...

CVE-2026-48517

CVE-2026-48517 affects MessagePack-CSharp (MessagePack for C#). The vulnerability arises because typeless deserialization’s safety check (ThrowIfDeserializingTypeIsDisallowed) only validates the outer type name and does not recursively inspect inner types such as array element types or generic ty...

CVE-2026-48517 MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays or generic arguments

MessagePack for C is a MessagePack serializer for C. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's typeless deserialization includes MessagePackSerializerOptions.ThrowIfDeserializingTypeIsDisallowedType as a safety check for dangerous types. The default implementation checks the outer type nam...

CVE-2026-48517 MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays or generic arguments

MessagePack for C is a MessagePack serializer for C. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's typeless deserialization includes MessagePackSerializerOptions.ThrowIfDeserializingTypeIsDisallowedType as a safety check for dangerous types. The default implementation checks the outer type nam...

CVE-2026-48517 MessagePack-CSharp: Typeless deserialization type restrictions do not recurse into arrays or generic arguments

MessagePack for C is a MessagePack serializer for C. Prior to 2.5.301 and 3.1.7, MessagePack-CSharp's typeless deserialization includes MessagePackSerializerOptions.ThrowIfDeserializingTypeIsDisallowedType as a safety check for dangerous types. The default implementation checks the outer type nam...

PT-2026-51397

Name of the Vulnerable Software and Affected Versions MessagePack for C versions prior to 2.5.301 MessagePack for C versions prior to 3.1.7 Description Runtime-generated union deserializers emitted by DynamicUnionResolver fail to call MessagePackSecurity.DepthStepref reader and do not decrement...

PT-2024-33272 · Unknown · Messagepack-Csharp

Name of the Vulnerable Software and Affected Versions: MessagePack-CSharp versions prior to 2.5.187 and 3.0.214 Description: The vulnerability occurs when the library is used to deserialize messagepack data from an untrusted source, leading to a risk of a denial of service attack by an attacker...