CVE-2026-36590 nanomq vulnerability
An issue in EMQ NanoMQ v.0.24.9 allows a remote attacker to cause a denial of service via the nni_qos_db_set function in broker_tcp.c component
Quick answer
emqx nanomq should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 0.24.9
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-36590 affects emqx nanomq and is rated high. An issue in EMQ NanoMQ v.0.24.9 allows a remote attacker to cause a denial of service via the nni_qos_db_set function in broker_tcp.c component Fix this first on internet-facing or admin systems. The practical fix is to upgrade to the latest vendor-supported patched release listed in the advisory, then verify the system is no longer exposed.
- Inventory every server, container, appliance, cluster, plugin, or device that uses emqx nanomq.
- Check the installed version and configuration against CVE-2026-36590 and the linked advisory.
- Apply the vendor fix: upgrade to the latest vendor-supported patched release listed in the advisory.
- Keep the broker off the public internet unless it is required and protected.
- Disable or isolate the affected feature if you cannot update right away.
- Review crash logs, restarts, and error spikes that match the vulnerable component.
- Rotate secrets, rebuild affected systems, or reset sessions if you suspect compromise.
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Verify the fix
- Confirm emqx nanomq is running the patched version or the approved mitigation is active.
- Confirm affected public, admin, API, tunnel, or cluster access is limited to trusted users.
- Repeat the risky workflow or a safe test case and confirm the issue no longer appears.
- Review logs again after the fix for crashes, bypass attempts, file access, or suspicious changes.
- Save version, config, log, and scan evidence for your remediation record.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-36590?
emqx nanomq versions listed as affected should be reviewed: 0.24.9.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.