CVE-2026-107726: Input Validation Flaw

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.

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Weakness Type (CWE)

CWE-20 Improper Input Validation

References

Other References

https://docs.hazelcast.com/hazelcast/5.7/release-notes/community https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0 https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j

Frequently Asked Questions

What is CVE-2026-107726? +

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.

How do I check if I'm vulnerable to CVE-2026-107726? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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