CVE-2026-44640: NanoMQ: QUIC Dialer Close Type Confusion

Severity: medium (CVSS 4.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-29 · updated 2026-07-22
Weakness: CWE-843

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.

Affected products

nanomq: before 0.24.14

References

https://github.com/nanomq/nanomq/releases/tag/0.24.14
https://github.com/nanomq/nanomq/security/advisories/GHSA-9fgw-v323-jmjj
https://github.com/nanomq/nanomq/security/advisories/GHSA-9fgw-v323-jmjj

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