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CVE-2026-47275— nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Decoder Leading to Remote DoS

CVSS 2.6 · Low EPSS 0.17% · P7

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProductVersion RangeStatus
nanomqnanomq<= 0.24.11affected
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I. Basic Information for CVE-2026-47275

Vulnerability Information
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Vulnerability Title
nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Decoder Leading to Remote DoS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
NanoMQ 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nanomq nanomq是nanomq的消息队列中间件。 NanoMQ 0.24.11及之前版本存在异常处理不当漏洞，该漏洞源于在对CONNECT消息解码时未正确使用变量，导致空指针取消引用，可能允许恶意MQTT服务器通过单个数据包崩溃连接客户端，造成远程拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
nanomqnanomq <= 0.24.11 -

II. Public POCs for CVE-2026-47275

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III. Intelligence Information for CVE-2026-47275

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Vendor Advisories for CVE-2026-47275 (1)

Same Patch Batch · nanomq · 2026-07-20 · 3 CVEs total

CVE-2026-472766.5 MEDIUMNULL Pointer Dereference in REST API properties_parse via Malformed user_properties
CVE-2026-352176.5 MEDIUMNanoMQ Incorrectly Accepts a Malformed SUBSCRIBE and Can Be Driven into an ASAN-Detectable

IV. Related Vulnerabilities

Same product: nanomq
Same vendor: nanomq
Same weakness: CWE-476

V. Comments for CVE-2026-47275

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