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Vulnerability record · CVE-2026-25627 · published 30 March 2026

CVE-2026-25627: Emqx nanomq out-of-bounds read vulnerability

Emqx · Nanomq

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header while providing a much shorter actual payload. The code path copies Remaining Length bytes without verifying that the current receive buffer contains that many bytes, resulting in an out-of-bounds read (ASAN reports OOB / crash). This is remotely triggerable over the WebSocket listener. This issue has been patched in version 0.24.8.

7.5 CVSS 3.1 High EPSS 0.60% · top 53.2% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header while providing a much shorter actual payload. The code path copies Remaining Length bytes without verifying that the current receive buffer contains that many bytes, resulting in an out-of-bounds read (ASAN reports OOB / crash). This is remotely triggerable over the WebSocket listener. This issue has been patched in version 0.24.8.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09e Patch
https://github.com/nanomq/NanoNNG/pull/1405 Issue TrackingPatch
https://github.com/nanomq/nanomq/releases/tag/0.24.8 Release Notes
https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x ExploitVendor Advisory
https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-25627), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.