CVE-2026-107726 Hazelcast - Information Disclosure & Remote Code Execution

Hazelcast < 5.4.5, < 5.5.10, and < 5.6.1 contain an information disclosure and potential remote code execution caused by improper validation of data from malicious clients, letting attackers read arbitrary memory and crash or corrupt cluster members, exploit requires attacker to connect to the cluster.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure, Denial Of Service, Remote Code Execution
CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Upgrade to versions 5.4.5, 5.5.10, 5.6.1, or 5.7.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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