CVE-2026-25627: medium-severity vulnerability in nanomq
nanomq: OOB Read / Crash (DoS) via Malformed MQTT Remaining Length over WebSocket
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.5%
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:L/UI:N/S:U/C:N/I:N/A:H
Affected products
nanomq · nanomqRelated CVEs — nanomq
In the same product, most dangerous first.
CVE-2026-32135HIGHNanoMQ has Heap Buffer Overflow in URI Parameter ParsingEPSS 0.5%CVE-2026-44639LOWNanoMQ: O(N²) Denial of Service in MQTT v5 Property ParsingEPSS 0.4%CVE-2026-32696LOWNanoMQ HTTP Auth: Missing username/password can trigger a NULL-pointer strlen() in auth_http.c:set_data(), causing a process crash — SIGSEGV, remotely triggerableEPSS 0.4%CVE-2026-47276MEDIUMNULL Pointer Dereference in REST API properties_parse via Malformed user_propertiesEPSS 0.4%CVE-2026-32134MEDIUMNanoMQ: NULL Pointer Dereference Crash in tcptran_pipe_peer During Session RestoreEPSS 0.4%CVE-2025-59946HIGHNanoMQ has a Use After Free vulnerability via sub info listEPSS 0.4%