{"id":"CVE-2026-107726","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-107726","generatedAt":"2026-10-28T03:39:45.668Z","title":"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.","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.","published":"2026-10-08T22:17:29.000Z","lastModified":"2026-10-09T16:35:36.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":9.3,"severity":"CRITICAL","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/M"},"cwe":["CWE-20"],"affected":[],"epss":{"score":0.00383,"percentile":0.32217,"date":"2026-10-27","history":[{"date":"2026-10-09","score":0.00383,"percentile":0.30309}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-08T22:17:29.000Z","detail":{"score":"9.3","severity":"CRITICAL","publishedAt":"2026-10-08T22:17:29.120Z"},"summary":"New CVE, critical severity (CVSS 9.3)."}],"references":[{"url":"https://docs.hazelcast.com/hazelcast/5.7/release-notes/community","source":"security-advisories@github.com"},{"url":"https://docs.hazelcast.com/hazelcast/5.7/release-notes/enterprise","source":"security-advisories@github.com"},{"url":"https://github.com/hazelcast/hazelcast/commit/361979da12f18950c24719db832ca6c5e7c0534f","source":"security-advisories@github.com"},{"url":"https://github.com/hazelcast/hazelcast/releases/tag/v5.7.0","source":"security-advisories@github.com"},{"url":"https://github.com/hazelcast/hazelcast/security/advisories/GHSA-6v25-8wq6-xq4j","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-107726","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}