CVE-2026-61633
lowNanoMQ is an MQTT broker.
NanoMQ is an MQTT broker. Prior to 0.24.14, the NanoMQ client function nni_mqtt_msg_decode_unsubscribe() in nng/src/supplemental/mqtt/mqtt_codec.c does not handle a failed read_uint16() while counting topics in a malformed UNSUBSCRIBE packet. A zero-length topic followed by trailing data can leave buf.curpos unchanged while topic_count continues to increase, allowing a malicious MQTT broker to hang a connecting MQTT 3.1.1 client, consume CPU and memory, and repeatedly deny service when automatic reconnection is enabled. The broker-side nmq_unsubinfo_decode path is not affected. This issue is fixed in version 0.24.14.
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/nanomq/NanoNNG/commit/fa8d859bb39841e46cfc6cce280d242bd782ad3d security-advisories@github.com
- https://github.com/nanomq/NanoNNG/pull/1518 security-advisories@github.com
- https://github.com/nanomq/nanomq/releases/tag/0.24.14 security-advisories@github.com
- https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr security-advisories@github.com
- https://github.com/nanomq/nanomq/security/advisories/GHSA-m7mp-rr3v-hmhr 134c704f-9b21-4f2e-91b3-4a467353bcc0