---
cve: "CVE-2026-25627"
severity: "MEDIUM"
cvss: 6.5
epss: "47%"
vendor: "nanomq"
kev: false
exploited: false
published: "2026-03-30 21:17:07"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T03:45:49+02:00"
---

# CVE-2026-25627

> 6.5 MEDIUM · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 6d061f2ead072a072f65ad2ae098155dabd3fd5a (Commit)
- e80b30bad6d855593a68d18f2785bfaca6faf09e (Commit)

## Referenzen

- <https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x>
- <https://github.com/nanomq/NanoNNG/pull/1405>
- <https://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09e>
- <https://github.com/nanomq/nanomq/releases/tag/0.24.8>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-25627) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_