---
cve: "CVE-2026-71255"
severity: "HIGH"
cvss: 8.6
epss: "22%"
vendor: "debevv"
kev: false
exploited: false
published: "2026-08-05 12:18:57"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T06:10:53+02:00"
---

# CVE-2026-71255

> 8.6 HIGH · 🧪 PoC

## Beschreibung

nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter.

## CVSS-Vektor

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

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

## Patch verfügbar (OSV)

- 91d6782930ee263bc760f27b0cbc5b82773c5f0d (Commit)

## Referenzen

- <https://github.com/debevv/nanoMODBUS>
- <https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71255) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_