Disclosure summary
Hazelcast is a unified real-time data platform combining stream processing with a fast data store. Prior to 5.4.5, 5.5.10, and 5.6.1, improper validation of data supplied by a malicious client able to connect to a cluster allows arbitrary reads from a cluster member's Java heap, off-heap data, and JVM process address space. The same flaw can crash cluster members and, in some Hazelcast Enterprise Edition configurations, corrupt memory with possible arbitrary code execution. Both slim and full distributions are affected. This issue is fixed in versions 5.4.5, 5.5.10, 5.6.1, and 5.7.0.
Source-reported weakness categories
CWE-20
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-107726
Open original source · Updated Oct 09, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
GitHub Reviewed Security Advisories · GHSA-6v25-8wq6-xq4j
Open original source · Updated Oct 08, 2026
Hazelcast allows arbitrary member memory access by low-privileged client
Source severity: CRITICAL / 9.3
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| maven | com.hazelcast:hazelcast | = 5.6.0 | 5.7.0 |
| maven | com.hazelcast:hazelcast | >= 5.5.0, < 5.5.10 | 5.7.0 |
| maven | com.hazelcast:hazelcast | < 5.4.5 | 5.7.0 |
Original records & references
PUBLISHED 2026-10-08T18:17:29-04:00
MODIFIED 2026-10-09T12:35:35-04:00
INGESTED 2026-10-10T20:55:03-04:00