CVE-2026-107726
Description
A flaw was found in Hazelcast. Improper validation of client-supplied data allows a connected client to corrupt memory, potentially leading to arbitrary code execution on cluster members. Additionally, an attacker can exploit this vulnerability to read sensitive memory contents from cluster nodes or crash them, resulting in a denial of service (DoS).
Statement
This vulnerability is rated as Important severity for Red Hat products because an attacker with network connectivity to a cluster member can remotely access process memory, crash cluster instances, or potentially execute arbitrary code without requiring elevated privileges. Any compromised application or client permitted to connect to the cluster communication port can exploit this input handling flaw to disclose sensitive heap data or trigger cluster-wide denial of service.
Mitigation
Restrict network connectivity to Hazelcast cluster member communication ports (default TCP 5701 through 5708) using firewall rules so that only verified, trusted client systems can establish connections.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.8 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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