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CVE-2026-47275
No affected components available
In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in nni_mqttv5_msg_decode_connect() allows a malicious MQTT broker to crash any connecting NanoMQ MQTTv5 client (including bridge mode) with a single packet, causing remote denial of service via SIGSEGV. In nni_mqttv5_msg_decode_connect() (mqtt_codec.c:1863), the code iterates over CONNECT properties using variable prop when it should use will_prop. When a CONNECT packet has no connect-level properties (prop == NULL) but has will properties (will_prop != NULL), dereferencing prop->next causes SIGSEGV at address 0x38 (NULL + offsetof(property, next)).
This affects both nanomq_cli and NanoMQ bridge mode (Core component), as both use the same mqtt_client.c receive path. This can lead to remote DoS if a malicious MQTT broker can crash the client process with a single 35-byte packet and persistent DoS if auto-reconnect causes infinite crash loop.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a low impact on the availability of the system.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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