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Vulnerability record · CVE-2026-32696 · published 30 March 2026

CVE-2026-32696: Emqx nanomq null pointer dereference vulnerability

Emqx · Nanomq

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.

7.5 CVSS 3.1 High EPSS 0.56% · top 55.7% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8b Patch
https://github.com/nanomq/NanoNNG/pull/1394 Issue TrackingPatch
https://github.com/nanomq/nanomq/releases/tag/0.24.7 ProductRelease Notes
https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3p ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-32696), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.