---
id: CVE-2026-107726
title: >-
  Hazelcast is a unified real-time data platform combining stream processing
  with a fast data store
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
  arbitrar…
severity: critical
cwe:
  - CWE-20
vendor: hazelcast
product: 'com.hazelcast:hazelcast'
affected:
  - 'com.hazelcast:hazelcast = 5.6.0'
  - 'com.hazelcast:hazelcast >= 5.5.0, < 5.5.10'
  - 'com.hazelcast:hazelcast < 5.4.5'
patched:
  - 'com.hazelcast:hazelcast 5.7.0'
  - 'com.hazelcast:hazelcast 5.7.0'
  - 'com.hazelcast:hazelcast 5.7.0'
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:17:29.120'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107726'
references:
  - url: 'https://docs.hazelcast.com/hazelcast/5.7/release-notes/community'
    label: security-advisories@github.com
  - url: 'https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise'
    label: security-advisories@github.com
  - url: >-
      https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f
    label: security-advisories@github.com
  - url: 'https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-6v25-8wq6-xq4j'
tags:
  - nvd
  - ghsa
  - maven
aliases:
  - GHSA-6v25-8wq6-xq4j
ecosystem: maven
ingestedAt: '2026-10-08T22:11:53.869Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-107726)

Affected packages:

- `com.hazelcast:hazelcast = 5.6.0`
- `com.hazelcast:hazelcast >= 5.5.0, < 5.5.10`
- `com.hazelcast:hazelcast < 5.4.5`

Patched in:

- `com.hazelcast:hazelcast 5.7.0`
- `com.hazelcast:hazelcast 5.7.0`
- `com.hazelcast:hazelcast 5.7.0`

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