EUVD-2026-18464
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3Description
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.
Analysis
Out-of-bounds read in NanoMQ MQTT Broker webhook processing allows remote attackers with high privileges to trigger denial of service by sending malformed JSON payloads. Prior to version 0.24.10, the hook_work_cb() function in webhook_inproc.c passes unsanitized binary message buffers directly to cJSON_Parse(), which reads past buffer boundaries when payloads lack null terminators. …
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