CVE-2026-32696

low-risk
Published 2026-03-30

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.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.1/10 Low
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Emqx

References (4)

Patch https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8...
Issue Tracking https://github.com/nanomq/NanoNNG/pull/1394
Product https://github.com/nanomq/nanomq/releases/tag/0.24.7
Exploit https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p
16
/ 100
low-risk
Severity 11/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal