Input validation error in Hazelcast - #VU153045
Published: October 1, 2026
Vulnerability identifier: #VU153045
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper input validation in client and member error handling when connecting to a malicious member. A remote attacker can spoof a malicious member to execute arbitrary code.
In Kubernetes environments, exploitation may also expose service account tokens.
Affected software
Hazelcast
Remediation
Install security update from vendor's website.
Hazelcast - addressed in versions 5.4.5, 5.5.10, 5.6.2, 5.7.0