---
title: "CVE-2026-107726: Hazelcast - Information Disclosure & Remote Code Execution"
description: "Hazelcast < 5.4.5, < 5.5.10, and < 5.6.1 contain an information disclosure and potential remote code execution caused by improper validation of data from malicious clients, letting attackers read arbitrary memory and crash or corrupt cluster members, exploit requires attacker to connect to the cluster."
url: https://panop.io/threat-heartbeat/CVE-2026-107726/
---

# CVE-2026-107726 Hazelcast - Information Disclosure & Remote Code Execution

Hazelcast < 5.4.5, < 5.5.10, and < 5.6.1 contain an information disclosure and potential remote code execution caused by improper validation of data from malicious clients, letting attackers read arbitrary memory and crash or corrupt cluster members, exploit requires attacker to connect to the cluster.

CVSS base score 9.3 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107726)

## Details

Type

Information Disclosure

Impact

Information Disclosure, Denial Of Service, Remote Code Execution

CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-20](https://cwe.mitre.org/data/definitions/20.html)

## Vendor fix

Upgrade to versions 5.4.5, 5.5.10, 5.6.1, or 5.7.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107726](https://nvd.nist.gov/vuln/detail/CVE-2026-107726)
- [https://docs.hazelcast.com/hazelcast/5.7/release-notes/community](https://docs.hazelcast.com/hazelcast/5.7/release-notes/community)
- [https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise](https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise)
- [https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f](https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f)
- [https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0](https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0)
- [https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j](https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)