Vulnerability Description
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CONNECT without providing username/password, and the configuration params uses the placeholders %u / %P (e.g., username="%u", password="%P"), the HTTP request construction phase enters auth_http.c:set_data(). This results in calling strlen() on a NULL pointer, causing a SIGSEGV crash. This crash can be triggered remotely, resulting in a denial of service. This issue has been patched in version 0.24.7.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Emqx | Nanomq | < 0.24.7 |
Related Weaknesses (CWE)
References
- https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8Patch
- https://github.com/nanomq/NanoNNG/pull/1394Issue TrackingPatch
- https://github.com/nanomq/nanomq/releases/tag/0.24.7ProductRelease Notes
- https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3pExploitVendor Advisory
FAQ
What is CVE-2026-32696?
CVE-2026-32696 is a vulnerability with a CVSS score of 3.1 (LOW). NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling auth.http_auth (HTTP authentication), when a client connects to the broker using MQTT CON...
How severe is CVE-2026-32696?
CVE-2026-32696 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-32696?
Check the references section above for vendor advisories and patch information. Affected products include: Emqx Nanomq.