CVE-2026-71254
Critical · CVSS 9.8- CVSS
- 9.8
- nvd
- EPSS
- 0.48%
- 39th pct
- KEV
- No
- Class
- oss containerizable
- CWE-787
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.
References
Status: profiled · ingested 2026-08-10T18:00:50.000Z