CVE-2026-71254 — nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record()

CVE-2026-71254

nanoMODBUS Server-Side Out-of-Bounds Write in handle_read_file_record() PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
debevv / nanoMODBUS	affected 0 through 1.23.0

CWE

CWE-787

References

https://github.com/debevv/nanoMODBUS
https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.