CVE-2026-21452
HighSummary
W MessagePack dla Javy występuje podatność na odmowę usługi w wersjach przed 0.9.11, związana z deserializacją plików .msgpack zawierających obiekty EXT32 z długościami ładunków kontrolowanymi przez atakującego. Podczas deserializacji, biblioteka nie narzuca górnego ograniczenia na alokację tablicy bajtów, co może prowadzić do wyczerpania pamięci JVM.
Risk Assessment
Podatność ta umożliwia zdalny atak typu odmowa usługi na aplikacje, które deserializują nieufne pliki modelu .msgpack, co może prowadzić do przerwania działania usługi lub całkowitego wyczerpania pamięci.
Recommendation
Zaleca się aktualizację do wersji MessagePack dla Javy 0.9.11 lub nowszej, aby zlikwidować tę podatność oraz wprowadzenie mechanizmów weryfikacji długości ładunków w deserializowanych plikach.
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Original NVD description (English source)
MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later trusts the declared EXT payload length when materializing the extension data. When ExtensionValue.getData() is invoked, the library attempts to allocate a byte array of the declared length without enforcing any upper bound. A malicious .msgpack file of only a few bytes can therefore trigger unbounded heap allocation, resulting in JVM heap exhaustion, process termination, or service unavailability. This vulnerability is triggered during model loading / deserialization, making it a model format vulnerability suitable for remote exploitation. The vulnerability enables a remote denial-of-service attack against applications that deserialize untrusted .msgpack model files using MessagePack for Java.

