CVE-2026-71255 HIGH

CVE-2026-71255: nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()

Vendor Debevv
Product nanoMODBUS
Weakness CWE-787
Published August 5, 2026
Last update August 10, 2026
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 5, 2026 CVE published
August 10, 2026 Record updated