CVE-2026-107726
CriticalCVSS 9.3Summary
Hazelcast prior to 5.4.5, 5.5.10, and 5.6.1 contains improper validation of data supplied by a malicious client able to connect to a cluster, allowing 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. This issue is fixed in versions 5.4.5, 5.5.10, 5.6.1, and 5.7.0.
Risk Assessment
An attacker with cluster access could read sensitive data from memory, cause service crashes, or in some configurations execute arbitrary code.
Recommendation
Update Hazelcast to version 5.4.5, 5.5.10, 5.6.1, or 5.7.0 and restrict network access to the cluster to trusted clients only.
Other vulnerabilities in Hazelcast
See all- CVE-2023-33265High
In Hazelcast versions 5.0.4, 5.1 through 5.1.6, and 5.2 through 5.2.3, executor services do not properly check client permissions, allowing authenticated users to execute tasks on members without the required permissions.
- CVE-2023-33264Medium
In Hazelcast versions 5.0.4, 5.1 through 5.1.6, and 5.2 through 5.2.3, configuration routines do not properly mask passwords in member configuration, allowing Hazelcast Management Center users to view some secrets.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS