NULL pointer dereference in NanoMQ - CVE-2026-32696
Published: April 24, 2026
Vulnerability identifier: #VU127590
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-32696
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a null pointer dereference in auth_http.c:set_data() when processing an MQTT CONNECT request without username/password while HTTP authentication parameters use the %u and %P placeholders. A remote attacker can send a specially crafted MQTT CONNECT request to cause a denial of service.
User interaction is required.
Affected software
NanoMQ
How to mitigate CVE-2026-32696
Install security update from vendor's website.
NanoMQ - update to 0.24.7