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CVE-2026-47276— NULL Pointer Dereference in REST API properties_parse via Malformed user_properties

Quick assessment

Affected
nanomq nanomq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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properties_parse()函数中存在空指针取消引用，当向/api/v4/mqtt/publish发送带有user_properties为JSON数组而非JSON对象的POST请求时，strlen()被调用在一个NULL的item->string指针上，导致NanoMQ代理崩溃。

CVSS 6.5 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
nanomq nanomq <= 0.24.11 affected
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I. Basic Information for CVE-2026-47276

Vulnerability Information
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Vulnerability Title
NULL Pointer Dereference in REST API properties_parse via Malformed user_properties
Source: CVE Program / CVE List V5
Vulnerability Description
In nanomq versions 0.24.11 and earlier, a NULL pointer dereference in `properties_parse()` allows an authenticated attacker to crash the NanoMQ broker by sending a POST request to `/api/v4/mqtt/publish` with `user_properties` as a JSON array instead of a JSON object. The crash occurs because `strlen()` is called on a NULL `item->string` pointer when iterating over array elements. An authenticated attacker can exploit this to crash the NanoMQ broker process. This is patched in version 0.24.14.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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properties_parse()函数中存在空指针取消引用，当向/api/v4/mqtt/publish发送带有user_properties为JSON数组而非JSON对象的POST请求时，strlen()被调用在一个NULL的item->string指针上，导致NanoMQ代理崩溃。
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

Vendor Product Affected Versions CPE Subscribe
nanomq nanomq <= 0.24.11 -

II. Public POCs for CVE-2026-47276

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III. Intelligence Information for CVE-2026-47276

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Vendor Advisories for CVE-2026-47276 (1)

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

CVE-2026-35217 6.5 MEDIUM NanoMQ Incorrectly Accepts a Malformed SUBSCRIBE and Can Be Driven into an ASAN-Detectable
CVE-2026-47275 2.6 LOW nanomq NULL Pointer Dereference in MQTTv5 Client CONNECT Decoder Leading to Remote DoS

IV. Related Vulnerabilities

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