CVE-2026-71256
nanoMODBUS Client-Side Out-of-Bounds Read Leading to Wild-Pointer Write via object_id
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
nanoMODBUS through v1.23.0 contains an out-of-bounds stack read leading to a wild-pointer write in nmbs_read_device_identification_basic / recv_read_device_identification_res in nanomodbus.c. A fixed 3-element stack array order[3] = {0,1,2} maps object IDs to buffer indices. The server-supplied object_id field (0-255, read directly from the wire) is used without any bounds check as buf_index = order[object_id].
| CWE | CWE-125 |
| 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:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
debevv / nanoMODBUS
0 ≤ 1.23.0
References
Credits
Shukhratbek Uraiimov