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.
References8
- access.redhat.com/errata/RHSA-2026:53644
- access.redhat.com/errata/RHSA-2026:53806
- access.redhat.com/errata/RHSA-2026:70228
- access.redhat.com/errata/RHSA-2026:70229
- access.redhat.com/errata/RHSA-2026:70230
- access.redhat.com/errata/RHSA-2026:70277
- access.redhat.com/security/cve/CVE-2026-15555
- bugzilla.redhat.com/show_bug.cgi?id=2480637
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 58 · as of 12 November 2026
- CWE
- CWE-502
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.