CVEvulnerability

CVE-2026-61633

2.0 LOW Published 2026-09-18 Modified 2026-09-18 Official page ↗
Status
Deferred
Published
2026-09-18
Last modified
2026-09-18
Assigner
[email protected]
CVSS 3.1 ([email protected])
2.0 LOW — CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
Weaknesses
CWE-835

Description

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.

Related

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References