Use-after-free in NanoMQ - CVE-2025-66023
Published: January 23, 2026
Vulnerability identifier: #VU121963
CSH Severity: Low
CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-66023
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error within the MQTT bridge client component. A remote administrator can cause a denial of service condition on the target system.
Affected software
NanoMQ
How to mitigate CVE-2025-66023
Install updates from vendor's website.
NanoMQ - update to 0.24.5