High 8.6Published Aug 5, 2026

CVE-2026-71255nanoMODBUS Client-Side Out-of-Bounds Write via object_length in recv_read_device_identification_res()

Updated under an hour ago (Oct 26, 2026, 4:23 PM ET)

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It affects debevv nanoMODBUS. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for debevv nanoMODBUS

Exploited in the last 30 days

nanoMODBUS through v1.23.0 contains an out-of-bounds write in the Modbus client-side recv_read_device_identification_res function (FC 0x2B/MEI 0x0E, Read Device Identification) in nanomodbus.c. The server-supplied object_length field (0-246) is validated only against the remaining PDU size (res_size_left) and is never validated against the caller-supplied buffers_length parameter.

CVSS: 8.6 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: TuranSec
NVD analysis: Deferred
Record last updated: Aug 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

debevv nanoMODBUS debevv:nanomodbus (from the name)	through 1.23.0	CNA record

References

References

https://github.com/debevv/nanoMODBUS	third-party-advisory
https://github.com/debevv/nanoMODBUS/blob/master/nanomodbus.c	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.