CVE-2026-32696

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 v3 3.1 LOW

3.1^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.6 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8b	Patch
https://github.com/nanomq/NanoNNG/pull/1394	Issue Tracking Patch
https://github.com/nanomq/nanomq/releases/tag/0.24.7	Product Release Notes
https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-30 21:17

Updated : 2026-06-17 10:36

NVD link : CVE-2026-32696

Mitre link : CVE-2026-32696

CVE.ORG link : CVE-2026-32696

JSON object : View

Products Affected

emqx

nanomq

CWE

CWE-476

NULL Pointer Dereference

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