All vulnerabilities
CVE-2026-107726GHSA-6v25-8wq6-xq4j

com.hazelcast:hazelcast: Hazelcast allows arbitrary member memory access by low-privileged client

hazelcast com.hazelcast:hazelcastmavenLibraries & packages
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.38%Chance of exploitation activity in the next 30 days, higher than 31% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5.7.0Fixed versionGitHub
Published8 Oct 2026Updated 9 Oct 2026CVE List

What fixes it

  • 5.7.0com.hazelcast:hazelcast, mavenGitHub<dependency><groupId>com.hazelcast</groupId><artifactId>hazelcast</artifactId><version>5.7.0</version></dependency>
  • 5.7.0com.hazelcast:hazelcast, MavenOSV<dependency><groupId>com.hazelcast</groupId><artifactId>hazelcast</artifactId><version>5.7.0</version></dependency>

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Impact

A flaw has been found in Hazelcast Enterprise Edition and Community Edition, which would allow a low-privileged malicious client to read arbitrary data in memory from any cluster member (including Java heap memory, off-heap data, and JVM process address space). Additionally, such a client may be able to cause one or more cluster members to crash, or in some Enterprise Edition configurations also corrupt memory contents, potentially leading to remote code execution. Both slim and full distributions are affected.

Patches

Enterprise customers should upgrade to a fixed version of Hazelcast Enterprise Edition:

  • 5.7.0
  • 5.6.1
  • 5.5.10
  • 5.4.5

Customers with extended support contracts should contact Hazelcast Support for information on patches for older versions.

Community Edition users should upgrade to version 5.7.0.

Hazelcast also recommends all customers follow the advice in our Security Hardening guide, including:

Workarounds

If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise.

References

Security Advisory on the Hazelcast Support Portal

Text from GitHub Advisory Database

Affected versions 62

  • com.hazelcast:hazelcast, maven= 5.6.0GitHub
  • com.hazelcast:hazelcast, maven>= 5.5.0, < 5.5.10GitHub
  • com.hazelcast:hazelcast, maven< 5.4.5GitHub
  • hazelcastaffected: < 5.4.5CVE List
  • hazelcastaffected: >= 5.5.0, < 5.5.10CVE List
  • hazelcastaffected: >= 5.6.0, < 5.6.1CVE List
  • com.hazelcast:hazelcast, Mavenfrom 5.6.0, fixed in 5.7.0OSV
  • com.hazelcast:hazelcast, Maven5.6.0OSV
  • com.hazelcast:hazelcast, Mavenfrom 5.5.0, fixed in 5.7.0OSV
  • com.hazelcast:hazelcast, Maven5.5.0OSV
  • com.hazelcast:hazelcast, Maven5.6.0-BETA-1OSV
  • com.hazelcast:hazelcast, Mavenfrom first release, fixed in 5.7.0OSV
  • com.hazelcast:hazelcast, Maven1.5OSV
  • com.hazelcast:hazelcast, Maven1.5.1OSV
  • com.hazelcast:hazelcast, Maven1.5.2OSV
  • com.hazelcast:hazelcast, Maven1.5.3OSV
  • com.hazelcast:hazelcast, Maven1.6OSV
  • com.hazelcast:hazelcast, Maven1.6-RC1OSV
  • com.hazelcast:hazelcast, Maven1.7OSV
  • com.hazelcast:hazelcast, Maven1.7-RC1OSV
  • com.hazelcast:hazelcast, Maven1.7-RC2OSV
  • com.hazelcast:hazelcast, Maven1.7-RC3OSV
  • com.hazelcast:hazelcast, Maven1.7-RC4OSV
  • com.hazelcast:hazelcast, Maven1.7.1OSV
  • com.hazelcast:hazelcast, Maven1.8OSV
  • com.hazelcast:hazelcast, Maven1.8.1OSV
  • com.hazelcast:hazelcast, Maven1.8.2OSV
  • com.hazelcast:hazelcast, Maven1.8.3OSV
  • com.hazelcast:hazelcast, Maven1.8.4OSV
  • com.hazelcast:hazelcast, Maven1.8.5OSV
  • com.hazelcast:hazelcast, Maven1.9OSV
  • com.hazelcast:hazelcast, Maven1.9.1OSV
  • com.hazelcast:hazelcast, Maven1.9.1-RC2OSV
  • com.hazelcast:hazelcast, Maven1.9.2OSV
  • com.hazelcast:hazelcast, Maven1.9.2.1OSV
  • com.hazelcast:hazelcast, Maven1.9.2.2OSV
  • com.hazelcast:hazelcast, Maven1.9.2.3OSV
  • com.hazelcast:hazelcast, Maven1.9.3OSV
  • com.hazelcast:hazelcast, Maven1.9.3-RCOSV
  • com.hazelcast:hazelcast, Maven1.9.3.1OSV
  • com.hazelcast:hazelcast, Maven1.9.3.2OSV
  • com.hazelcast:hazelcast, Maven1.9.3.3OSV
  • com.hazelcast:hazelcast, Maven1.9.3.4OSV
  • com.hazelcast:hazelcast, Maven1.9.4OSV
  • com.hazelcast:hazelcast, Maven1.9.4-RCOSV
  • com.hazelcast:hazelcast, Maven1.9.4-RC1OSV
  • com.hazelcast:hazelcast, Maven1.9.4.1OSV
  • com.hazelcast:hazelcast, Maven1.9.4.2OSV
  • com.hazelcast:hazelcast, Maven1.9.4.3OSV
  • com.hazelcast:hazelcast, Maven1.9.4.4OSV
  • com.hazelcast:hazelcast, Maven1.9.4.5OSV
  • com.hazelcast:hazelcast, Maven1.9.4.6OSV
  • com.hazelcast:hazelcast, Maven1.9.4.8OSV
  • com.hazelcast:hazelcast, Maven2.0OSV
  • com.hazelcast:hazelcast, Maven2.0-RC1OSV
  • com.hazelcast:hazelcast, Maven2.0-RC2OSV
  • com.hazelcast:hazelcast, Maven2.0.1OSV
  • com.hazelcast:hazelcast, Maven2.0.2OSV
  • com.hazelcast:hazelcast, Maven2.0.3OSV
  • com.hazelcast:hazelcast, Maven2.0.4OSV
  • com.hazelcast:hazelcast, Maven2.1OSV
  • com.hazelcast:hazelcast, Maven2.1.1OSV

References 6