Vulnerability in com.hazelcast:hazelcast (CVE-2026-107726)
Summary
Vulnerability in com.hazelcast:hazelcast (CVE-2026-107726). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.7.0 or later.
Original description
The description as published by the source.
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:
- Ensure Hazelcast Security is enabled and client authorization is enforced.
- Define an explicit allowlist for zero config Compact serialization.
- Avoid deploying clients on internet-facing non-secure networks or n…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-107726 has been found in com.hazelcast:hazelcast.
Risk of unauthorized operations or information disclosure.
What to do: upgrade com.hazelcast:hazelcast to 5.7.0 or later.
If unsure, ask your IT team or search "com.hazelcast:hazelcast CVE-2026-107726" on the vendor's site.
CVE-2026-107726 (com.hazelcast:hazelcast) — CWE-20
Patched: 5.7.0 — apply immediately
Workaround: If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-20) exists in com.hazelcast:hazelcast.
Check the vendor advisory for the affected versions of com.hazelcast:hazelcast.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 5.7.0.
Workaround: If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで com.hazelcast:hazelcast を使っているサービスとバージョンを洗い出す。
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2Apply temporary workaround mitigate
If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise.パッチが適用されるまでの応急処置として、If you cannot update to a fixed version immediately, restrict cluster access to trusted clients only and ensure clients are hardened against compromise. を実施。回避策の副作用 (機能低下) を確認した上で。
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3Apply patch patch
Upgrade com.hazelcast:hazelcast to 5.7.0ステージング環境で 5.7.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。