CVE-2026-54410

high

Description

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.

References

https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369

https://github.com/debevv/nanoMODBUS

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-36661

https://cwe.mitre.org/data/definitions/787.html

https://cwe.mitre.org/data/definitions/193.html

Details

Source: Mitre, NVD

Published: 2026-06-14

Updated: 2026-08-10

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:C

Severity: High

CVSS v3

Base Score: 8.6

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Severity: High

CVSS v4

Base Score: 8.8

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00541