Critical 9.3Published Oct 8, 2026

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

Updated under an hour ago (2026-10-19 08:23 UTC)

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It affects hazelcast. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.38%, higher than 31% of scored CVEs.

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Every CVE for hazelcast

Exploited in the last 30 days

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.

CVSS: 9.3 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.38% (percentile 31)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

hazelcast hazelcast hazelcast:hazelcast (from the name)	before 5.4.5; from 5.5.0, < 5.5.10; from 5.6.0, < 5.6.1	CNA record

References

https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4jx-refsource-confirm
https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534fx-refsource-misc
https://docs.hazelcast.com/hazelcast/5.7/release-notes/communityx-refsource-misc
https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprisex-refsource-misc
https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.