CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-25627
High (7.5) in emqx nanomq. EPSS 0.5% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
- CWE
- CWE-125
- Published
- Modified
- Record from
- the NVD, synced
Affected
- emqx:nanomq
References
- https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09e
- https://github.com/nanomq/NanoNNG/pull/1405
- https://github.com/nanomq/nanomq/releases/tag/0.24.8
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x