CVE-2025-59947 NanoMQ has Buffer Overflow

High 8.5 Published 15 Dec 2025 Updated 15 Dec 2025

A buffer overflow in NanoMQ allows attackers to execute arbitrary code or cause denial of service via crafted PUBLISH packets.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-59947?

CVE-2025-59947 is a high-severity memory corruption vulnerability in nanomq, published on 15 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

NanoMQ is a messaging broker/bus for IoT Edge & SDV. Versions prior to 0.24.4 have a buffer overflow case while the PUBLISH packets trigger both shared subscription and vanila subscription. This is fixed in version 0.24.4. As a workaround, disable shared subscription.

Weakness: CWE-120

Which versions are affected by CVE-2025-59947?

It affects 1 product.

Products include Emqx Nanomq.

How do I fix CVE-2025-59947?

No fix has been published for CVE-2025-59947 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-2025-59947 being exploited?

There is no known exploitation of CVE-2025-59947 in the wild and no public exploit code.

Sources

Also known as GHSA-98f4-cmg8-x7f3.