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[ CVE-2026-107726 · Published 8 Oct 2026 ]

Hazelcast allows arbitrary member memory access by low-privileged client

CVSS 9.3 EPSS <1%1 agency advisoryFix available

[ Why it matters ]Priority signals

  • Critical severity: CVSS 9.3

[ Description ]Official 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.

[ Fixes ]Fixes and patches

  • com.hazelcast:hazelcast 5.7.0Fixed version · GitHub Advisories · maven package com.hazelcast:hazelcast: upgrade to 5.7.0 or later (affected = 5.6.0)

[ Advisories ]Government CERT advisories

[ Packages ]Affected open-source packages

[ References ]References