CVE-2026-44640 NanoMQ: QUIC Dialer Close Type Confusion
A type confusion in NanoMQ's QUIC dialer close path can cause a hang or crash, leading to denial of service.
- 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-2026-44640?
CVE-2026-44640 is a medium-severity memory corruption vulnerability in nanomq, published on 29 May 2026. 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 MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to 0.24.14, aio->prov_data is stored as nni_quic_conn* during dialing, but read as ex_quic_conn* during dialer close. This type confusion causes invalid object interpretation and leads to close-path hang/crash behavior. This vulnerability is fixed in 0.24.14.
Weakness: CWE-843
Which versions are affected by CVE-2026-44640?
How do I fix CVE-2026-44640?
No fix has been published for CVE-2026-44640 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-2026-44640 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44640 exists.
Sources
Also known as GHSA-9fgw-v323-jmjj.