CVE-2026-32696

Name: CVE-2026-32696
Creator: NVD / NIST
Published: 2026-03-30T21:17:09.603+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2026-32696 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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(). EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.40%

31.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Emqx	Nanomq	< 0.24.7

References

https://github.com/nanomq/NanoNNG/commit/c20aa27e5290bb480a5315099952480d35f37a8bPatch
https://github.com/nanomq/NanoNNG/pull/1394Issue Tracking, Patch
https://github.com/nanomq/nanomq/releases/tag/0.24.7Product, Release Notes
https://github.com/nanomq/nanomq/security/advisories/GHSA-77f4-wvq8-mp3pExploit, Vendor Advisory

Timeline

Published: Mar 30, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-32696?

How severe is CVE-2026-32696?

CVE-2026-32696 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2026-32696?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-32696?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST