Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Emqx | Nanomq | < 0.24.8 |
Related Weaknesses (CWE)
References
- https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09Patch
- https://github.com/nanomq/NanoNNG/pull/1405Issue TrackingPatch
- https://github.com/nanomq/nanomq/releases/tag/0.24.8Release Notes
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29xExploitVendor Advisory
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29xExploitVendor Advisory
FAQ
What is CVE-2026-25627?
CVE-2026-25627 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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...
How severe is CVE-2026-25627?
CVE-2026-25627 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25627?
Check the references section above for vendor advisories and patch information. Affected products include: Emqx Nanomq.