CVE-2026-25627
highpriority · track · 30EPSS 0.005 · 42 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2026-25627cnnvd
- https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09ecnnvd
- https://github.com/nanomq/NanoNNG/pull/1405cnnvd
- https://github.com/nanomq/nanomq/releasesPatchcnnvd
- https://github.com/nanomq/nanomq/releases/tag/0.24.8cnnvd
- https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29xcnnvd
- https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09eenisa_euvd
- https://github.com/nanomq/NanoNNG/pull/1405enisa_euvd
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