CVE-2026-47276 Details
Description
In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `properties_parse()` allows an authenticated attacker to crash the NanoMQ broker by sending a POST request to `/api/v4/mqtt/publish` with `user_properties` as a JSON array instead of a JSON object. The crash occurs because `strlen()` is called on a NULL `item->string` pointer when iterating over array elements. An authenticated attacker can exploit this to crash the NanoMQ broker process. This is patched in version 0.24.14.
A NULL pointer dereference vulnerability has been identified in NanoMQ versions through 0.24.11. The issue arises in the `properties_parse()` function, where the code incorrectly assumes that `user_properties` is a JSON object. This flaw allows an authenticated attacker to crash the NanoMQ broker by sending a POST request to `/api/v4/mqtt/publish` with `user_properties` formatted as a JSON array instead of a JSON object. The exploitation occurs because the function attempts to read the length of a NULL pointer, leading to a segmentation fault and causing the broker process to terminate. This vulnerability requires authentication and can be exploited using the default REST API credentials of `admin:public`. The crash disrupts all connected MQTT clients, causing a widespread denial-of-service effect.
Users can upgrade to NanoMQ version 0.24.14 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 20, 2026CISA-ADP
Assessed Jul 20, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nanomq/nanomq/security/advisories/GHSA-qq2v-xvxg-3hvf | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/nanomq/nanomq/security/advisories/GHSA-qq2v-xvxg-3hvf | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nanomq | <= 0.24.11 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 20, 2026 | CVE Modified | CISA-ADP |
| Jul 20, 2026 | New CVE Received | [email protected] |