CVE-2026-107726

Hazelcast: Arbitrary member memory access by low-privileged client

Description

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.

Scores

Weaknesses (CWE)

• CWE-20

Advisories

• GHSA-6v25-8wq6-xq4j — Hazelcast allows arbitrary member memory access by low-privileged client

European references

• ENISA EUVD · EUVD-2026-95314
• GCVE · GCVE-0-2026-107726

CERT-FR advisories

• CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr

Affected products

References

• https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j
• https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f
• https://docs.hazelcast.com/hazelcast/5.7/release-notes/community
• https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise
• https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0

Sources