CVE-2026-54410

EUVD-2026-36661
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.6 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 43.76%
Common Weakness Enumeration
References
https://cwe.mitre.org/data/definitions/193.html
https://cwe.mitre.org/data/definitions/787.html
https://github.com/debevv/nanoMODBUS
https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369