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CVE-2026-15555

Severity8.8 High CVSS 3.1
WeaknessDeserialization of untrusted data (CWE-502)
Published11 Aug 2026
Updated1 Nov 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.84% chance in 30 days

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Decided by A vulnerability class already blocked by an ARMR security rule
Finding Protected by Waratek's ARMR deserialization security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's weakness is CWE-502: Deserialization of Untrusted Data.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=2480637 : a Red Hat bug: the triage, which links onward to the fix

How to mitigate CVE-2026-15555

Apply the vendor's fix. Until you can, Waratek RASP blocks exploitation with its deserialization and process rules. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=2480637 bugzilla
https://access.redhat.com/errata/RHSA-2026:53644
https://access.redhat.com/errata/RHSA-2026:53806
https://access.redhat.com/errata/RHSA-2026:70228
https://access.redhat.com/errata/RHSA-2026:70229
https://access.redhat.com/errata/RHSA-2026:70230
https://access.redhat.com/errata/RHSA-2026:70277
https://access.redhat.com/security/cve/CVE-2026-15555

Timeline

Published2026-08-11By the CVE Program.
NVD record modified2026-11-01NVD's own last-modified date for this record.