Is CVE-2026-15555 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15555?

CVE-2026-15555 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-15555

Description

A flaw was found in JBoss marshalling. The Infinispan session replication path deserializes replicated session data via the JBoss Marshalling River unmarshaller with no class filtering — enabling RCE via deserialization gadget chains on every cluster node.