CVE Watch13 de nov. de 2026

CVE-2026-126366

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.7, the Java-platform msgpack gem for

CVSS

7.5

Alta

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 13 de nov. de 2026 · Última mod.: 13 de nov. de 2026 · CWE-770 · CWE-1325

EPSS · 30d

Ainda não há histórico EPSS suficiente.

Descrição técnica

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.7, the Java-platform msgpack gem for JRuby allocated arrays and byte buffers directly from attacker-controlled array32, str32, and bin32 declared sizes before confirming that corresponding elements or bytes were available. A short MessagePack header could therefore trigger a very large allocation or sustained heap growth when an application decoded untrusted input through MessagePack.unpack or MessagePack::Unpacker, potentially exhausting the shared JVM heap. map32 and declared counts at or above 2^31 did not use the affected allocation behavior. This issue is fixed in version 1.8.7.

Referências oficiais

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