High 8.6Published Jun 14, 2026

CVE-2026-54410nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field

Updated under an hour ago (Oct 28, 2026, 10:10 AM 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 off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.

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-193, 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	product
https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369	product
https://cwe.mitre.org/data/definitions/193.html	technical-description
https://cwe.mitre.org/data/definitions/787.html	technical-description

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.