CVE-2026-107726

critical

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.

References

https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j

https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0

https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95314

https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise

https://docs.hazelcast.com/hazelcast/5.7/release-notes/community

Details

Source: Mitre, NVD

Published: 2026-10-08

Updated: 2026-10-09

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: Critical

EPSS

EPSS: 0.00383