CVE-2026-34608— nanomq: Heap-Buffer-Overflow in webhook_inproc.c via cJSON_Parse OOB Read

nanomq: Heap-Buffer-Overflow in webhook_inproc.c via cJSON_Parse OOB Read

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.10, in NanoMQ's webhook_inproc.c, the hook_work_cb() function processes nng messages by parsing the message body with cJSON_Parse(body). The body is obtained from nng_msg_body(msg), which is a binary buffer without a guaranteed null terminator. This leads to an out-of-bounds read (OOB read) as cJSON_Parse reads until it finds a \0, potentially accessing memory beyond the allocated buffer (e.g., nng_msg metadata or adjacent heap/stack). The issue is often masked by nng's allocation padding (extra 32 bytes of zeros for non-power-of-two sizes <1024 or non-aligned). The overflow is reliably triggered when the JSON payload length is a power-of-two >=1024 (no padding added). This issue has been patched in version 0.24.10.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

跨界内存读

NanoMQ 安全漏洞

NanoMQ是美国EMQ开源的一款用于物联网边缘平台的轻量级快速 MQTT Broker。 NanoMQ存在安全漏洞，该漏洞源于hook_work_cb函数使用cJSON_Parse解析消息体时存在越界读取，可能导致访问未分配的内存。

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