Out-of-bounds read in NanoMQ - CVE-2026-34608
Published: April 24, 2026
Vulnerability identifier: #VU127591
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34608
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: NanoMQ
Affected software:
NanoMQ
NanoMQ
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to out-of-bounds read in hook_work_cb() in webhook_inproc.c when parsing an nng message body with cJSON_Parse(). A remote privileged user can send a specially crafted PUBLISH message to cause a denial of service.
Exploitation requires the webhook feature to be enabled, and the issue is reliably triggered with a power-of-two JSON payload length of at least 1024 bytes.
How to mitigate CVE-2026-34608
Install security update from vendor's website.