Critical severity9.8NVD Advisory· Published Aug 5, 2026· Updated Aug 26, 2026
CVE-2026-71254
CVE-2026-71254
Description
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.
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Affected products
1- Range: <=1.23.0
Patches
Vulnerability mechanics
References
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