CVE-2026-71255
nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | debevv |
| Product | nanomodbus |
| Published | Aug 5, 2026 |
| Last Updated | Aug 10, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Affected Versions
debevv / nanoMODBUS
0 ≤ 1.23.0
References
Credits
Shukhratbek Uraiimov