CVE-2023-34488 Memory corruption in n/a

High 8.0 Published 12 Jun 2023 Updated 29 Aug 2025

A one-byte heap over-read in NanoMQ allows attackers to cause a denial of service via malformed MQTT messages.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-34488?

CVE-2023-34488 is a high-severity memory corruption vulnerability in n/a, published on 12 Jun 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

NanoMQ 0.17.5 has a one-byte heap-based buffer over-read in the conn_handler function of mqtt_parser.c when it processes malformed messages.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2023-34488?

It affects 1 product.

Products include Emqx Nanomq.

How do I fix CVE-2023-34488?

No fix has been published for CVE-2023-34488 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-34488 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-34488 exists.

Sources

Also known as GHSA-fm3v-8h6r-vmxw.