CVE-2026-15555 Deserialization in Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
Attackers can achieve remote code execution on cluster nodes by exploiting unfiltered deserialization in the Infinispan session replication path.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15555?
CVE-2026-15555 is a high-severity unsafe deserialization vulnerability in Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7, published on 11 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-15555?
How do I fix CVE-2026-15555?
Apply the vendor's patch.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-15555 being exploited?
There is no known exploitation of CVE-2026-15555 in the wild and no public exploit code.
Sources
Also known as GHSA-8qrr-8665-54fg.