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Vulnerability · Published Oct 8, 2026 · Assigned by GitHub_M

CVE-2026-107726Hazelcast: Arbitrary member memory access by low-privileged client

Critical 9.3

In plain English

A critical-severity improper input validation in hazelcast from hazelcast. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)9.3Critical
Exploit odds (30 days)0.4%top 67.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavencom.hazelcast:hazelcast5.7.0GHSA-6v25-8wq6-xq4j
Mavencom.hazelcast:hazelcast5.7.0GHSA-6v25-8wq6-xq4j
Mavencom.hazelcast:hazelcast5.7.0GHSA-6v25-8wq6-xq4j

Affected products (as reported)

VendorProductVersions
hazelcast hazelcast < 5.4.5>= 5.5.0, < 5.5.10>= 5.6.0, < 5.6.1

Weakness: CWE-20 · 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

References