CVE-2026-32134
5.9 MEDIUMNanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform
Published: 2026-05-19 · Last updated: 2026-05-19
Severity and scoring
- CVSS
- 5.9 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-476
Description
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In versions 0.24.10 and below, when NanoMQ handles high-concurrency reconnect traffic using a reconnect-collision payload, the broker can crash due to a NULL pointer dereference during MQTT session resumption for clean_start=0 clients. The transport's p_peer callback (tcptran_pipe_peer()) iterates cpipe->subinfol while copying session metadata from the cached old pipe to the new reconnecting pipe, without checking whether the pointer is NULL. Under a reconnect race, cpipe->subinfol can be freed and set to NULL before session restore invokes this function, resulting in a remote unauthenticated Denial-of-Service (process crash) condition. This issue has been fixed in version 0.24.11.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-32134
- [Other]https://github.com/nanomq/NanoNNG/commit/522ec62e29e60d1122f2aedaa6e702dcf089f7bb
- [Other]https://github.com/nanomq/nanomq/issues/2241
- [Other]https://github.com/nanomq/nanomq/releases/tag/0.24.11
- [Other]https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
- [Other]https://github.com/nanomq/nanomq/issues/2241
- [Other]https://github.com/nanomq/nanomq/security/advisories/GHSA-q36f-83mh-pcv2
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