CVE-2026-25627
Last modified
CVE-2026-25627 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.47% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Emqx | Nanomq | < 0.24.8 |
References
- https://github.com/nanomq/NanoNNG/pull/1405Issue Tracking, Patch
- https://github.com/nanomq/nanomq/releases/tag/0.24.8Release Notes
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29xExploit, Vendor Advisory
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29xExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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