CVE-2026-71254
nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus server-side handle_read_file_record function (FC 0x14, Read File Record) in nanomodbus.c. The function validates that the total request size does not exceed 245 bytes and that each sub-request's record_length is at most 124, but it never validates the CUMULATIVE response size across all sub-requests before processing them.
| 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: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